It is necessary that everyone (return) ______ books to the library on time.retur

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问题 It is necessary that everyone (return) ______ books to the library on time.

选项

答案 return/should return

解析本题考点是虚拟语气。It is necessary that后从句谓语动词应用 should+动词原形(should可省)。本句大意：按时把书归还给图书馆是必要的。

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