Question

gg.1 is it a phrase or a clause?
is the group of words in bold a phrase or a clause?
built to honor all the gods, the pantheon is a monument that is an exceptional example of ancient roman architecture.
phrase
clause
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Explanation:

A phrase lacks a subject-verb pair that expresses a complete thought. The bolded text "that is an exceptional example of ancient Roman architecture" contains a subject ("that") and a verb ("is"), forming a dependent clause.

Answer:

clause