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The students began whispering and giggling once they saw the teacher close the book, The adverb clause once they saw the teacher close the book modifies what?

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Answer:

The answer is A:the verb began.

Step-by-step explanation:

User Heykarimoff
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This adverb clause modifies the verb phrase began whispering and giggling, by telling when the action happened. An adverb clause is a dependent (subordinate) clause, which means that it cannot stand on its own. If it stood on its own, it would be an incomplete sentence. Therefore, it is a supplement to the main clause. In this case, it begins with a subordinate conjunction once.