Question

select the misplaced or dangling modifier.

upon removing a leather-bound photo album, the bookshelf spun around slowly to reveal a hidden chamber.

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Explanation:

A dangling modifier occurs when the word/phrase being modified is unclear or missing. Here, "Upon removing a leather-bound photo album" logically describes an action done by a person, but the sentence's subject is "the bookshelf," which cannot perform the action of removing an album. This makes the phrase a dangling modifier.

Answer:

Upon removing a leather-bound photo album