【題目】________ 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:把書還給圖書館是必要的。

考查it形式主語。It's它是;That's那是;This is這是;We are我們是。It's+形容詞+to do sth.表示做某事是……;it在這里是形式主語。真正的主語是動詞不定式“to return the books to the library.”根據(jù)題意,故選A。

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