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_____________ is necessary __________ he trains himself before the Guangzhou Marathon.

A.This, 不填B.The, 不填C.It, thatD.This, that

C

解析试题分析:句意:在广州马拉松比赛之前,他进行锻炼是必要的。本句所使用的句型是it is necessary that…,做某事是有必要的。这里that 引导的是主语从句,不能省略;it 是形式主语。故选C。
考点:考查主语从句。

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