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

    A. This, 不填 B. The, 不填

    C. It, that D. This, that

    【答案】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。

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