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【题目】________ necessary to return the books to the library.

A.It'sB.That's

C.This isD.We are

【答案】A

【解析】

句意:把书还给图书馆是必要的。

考查it形式主语。It's它是;That's那是;This is这是;We are我们是。It's+形容词+to do sth.表示做某事是……;it在这里是形式主语。真正的主语是动词不定式“to return the books to the library.”根据题意,故选A

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