【题目】— _________ ( )
—They are snakes.
A.What's this? B.What is that? C.What are they?
【答案】C
【解析】
句意：—_______？—它们是蛇。根据答语主语they，问句主语也用they，与选项C它们是什么？相匹配。故选C。
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