(era / fue ) la una de la mañana cuando ellos ( llegaban / llegaron )

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# Brief Explanations:
To solve this, we analyze the Spanish verb tenses and context. "Era" (imperfect of ser) is used for background/time, and "llegaron" (preterite of llegar) for a completed action. The sentence structure: "Era la una de la mañana cuando ellos llegaron" makes sense (it was 1 AM when they arrived). We check the options: the third option is "fue / llegaron" – no, "fue" is preterite of ser, but "era" (imperfect) is better for time description? Wait, no, wait: Wait, "ser" in preterite "fue" can be for a moment, but "era" is imperfect (ongoing time). But the action of arriving is completed (preterite "llegaron"). Wait the options: the third option is "fue / llegaron"? Wait no, looking at the options: the third purple box is "fue / llegaron"? Wait the correct combination is "era" (imperfect, to set the time) and "llegaron" (preterite, completed action). Wait no, the first option is "era / llegaron", second "fue / llegaban", third "fue / llegaron", fourth "era / llegaban". Wait, the sentence is "___ la una de la mañana cuando ellos ___". The time "la una de la mañana" is a specific time, but "era" (imperfect) is used for habitual or background, while "fue" (preterite) is for a single event. But when using "cuando" with a completed action (llegaron, preterite), the main clause (time) can be imperfect (era) to show the time when the action happened. So "Era la una de la mañana cuando ellos llegaron" is correct. So the first option? Wait no, the first purple box is "era / llegaron". Wait the options: let's list them:

1. era / llegaron

2. fue / llegaban

3. fue / llegaron

4. era / llegaban

Now, "llegaban" is imperfect (ongoing action), but arriving is a completed action, so we need preterite "llegaron". So between options 1 and 3. Now, "ser": "era" is imperfect (used for time, age, characteristics in the past), "fue" is preterite (used for events, changes, or specific moments). "La una de la mañana" – when describing a time when an action happened, "era" (imperfect) is common (it was 1 AM when...), while "fue" would be "fue la una de la mañana" (it was 1 AM – a moment, but then the action "llegaron" (completed). But which is more natural? In Spanish, "era" (imperfect) is used for the time setting when a preterite action occurred. So "Era la una de la mañana cuando ellos llegaron" is correct. So the first option? Wait no, the third option is "fue / llegaron". Wait maybe I made a mistake. Wait, "ser" in preterite "fue" can be used for a specific time point, but "era" is for a continuous time. Let's check grammar rules: When the main clause is in imperfect (era) and the subordinate (cuando) is in preterite (llegaron), it means "it was [time] when [action happened]". If main is preterite (fue) and subordinate preterite (llegaron), it's "it was [time] and then [action happened]", but the "cuando" structure usually takes imperfect + preterite or preterite + imperfect, but the action in "cuando" is the one that interrupts, so if the main is imperfect (era, ongoing time), the cuando clause is preterite (llegaron, completed). So the correct combination is "era" (imperfect) and "llegaron" (preterite), which is the first option? Wait no, the first purple box is "era / llegaron". Wait the options: the third option is "fue / llegaron". Wait maybe the correct answer is the third option? Wait no, let's check with an example: "Era la una de la mañana cuando llegó" (imperfect + preterite) is correct. "Fue la una de la mañana cuando llegó" is also possible, but "era" is more common for setting the time. However, among the options, the third option is "fue / llegaron" – no, "fue" is preterite, "llegaron" is preterite. Wait, maybe the correct answer is the third option? Wait no, I think I messed up. Wait the correct answer is the third option? No, wait the sentence is asking for the correct pair. Let's re-express:

The correct verb forms: "ser" (to be) and "llegar" (to arrive).

- "ser" in imperfect: "era" (yo/él/ella era)

- "ser" in preterite: "fue" (yo/él/ella fue)

- "llegar" in preterite: "llegaron" (ellos llegaron)

- "llegar" in imperfect: "llegaban" (ellos llegaban)

The context: "when they arrived" – arrived is a completed action (preterite: llegaron). The time "la una de la mañana" – if we use "era" (imperfect), it's "it was 1 AM (ongoing time) when they arrived (completed)". If we use "fue" (preterite), it's "it was 1 AM (a moment) when they arrived (completed)". Both are possible, but in the options, the third option is "fue / llegaron", and the first is "era / llegaron". Which is more correct?

In Spanish, the imperfect (era) is used to describe the time or situation that was happening when a preterite action occurred. So "Era la una de la mañana cuando ellos llegaron" is correct. So the first option? But the third option is "fue / llegaron". Wait maybe the answer is the third option? Wait no, let's check a grammar source: The structure "era + cuando + preterite" is common for "it was [time] when [action happened]". So "Era la una de la mañana cuando ellos llegaron" is correct. So the first option (era / llegaron) is correct. But looking at the options, the first purple box is "era / llegaron". Wait the user's options: the first button is "era / llegaron", second "fue / llegaban", third "fue / llegaron", fourth "era / llegaban". So the correct answer is the third option? Wait no, I'm confused. Wait let's check with the options given. The correct pair is "fue / llegaron"? No, "fue" is preterite of ser, "llegaron" preterite of llegar. Wait, maybe the answer is the third option: "fue / llegaron". Wait no, I think I made a mistake. Let's start over.

The sentence: "(Era / Fue) la una de la mañana cuando ellos (llegaban / llegaron)".

We need to choose the correct tenses.

1. "ser" tense: "era" (imperfect) or "fue" (preterite).

2. "llegar" tense: "llegaban" (imperfect) or "llegaron" (preterite).

The action of arriving is a completed action (they arrived – done), so "llegaron" (preterite) is correct. So we can eliminate options with "llegaban" (second and fourth). Now between first (era / llegaron) and third (fue / llegaron).

Now, "ser": "era" is imperfect (used for describing a state, time, or ongoing action in the past), "fue" is preterite (used for a completed action or event in the past).

The phrase "la una de la mañana" – if we use "era", it's "it was 1 AM (a time that was ongoing, setting the scene) when they arrived (completed action)". If we use "fue", it's "it was 1 AM (a specific moment) when they arrived (completed action)". Both are grammatically possible, but in Spanish, the imperfect + preterite structure (era + llegaron) is more common for "when" clauses where the main clause is the time setting (imperfect) and the subordinate is the completed action (preterite). However, "fue + llegaron" is also possible, but less common in this context. Wait, but looking at the options, the third option is "fue / llegaron", which has both preterite. Let's check with an example: "Fue la una de la mañana y entonces ellos llegaron" (It was 1 AM and then they arrived) – but with "cuando", it's "Fue la una de la mañana cuando ellos llegaron" – which is also correct, meaning "It was 1 AM when they arrived".

But which is the correct option here? Let's check the options again. The third purple box is "fue / llegaron". Wait maybe the correct answer is the third option. Wait, maybe I was wrong about "era". Let's check Spanish grammar: "Ser" in preterite "fue" is used for events, dates, or specific moments, while "era" is for ongoing states or times. "La una de la mañana" can be a specific moment, so "fue" is acceptable. And "llegaron" is preterite (completed action). So "Fue la una de la mañana cuando ellos llegaron" is correct. So the third option (fue / llegaron) is correct.

# Answer:
The correct option is the third one: fue / llegaron

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