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【题目】I think it is necessary for us _________ exercise every day.
A.take
B.to take
C.taking
D.taken

【答案】B
【解析】句意:我认为对我们来说每天锻炼是必要的。根据句型It is necessary for sb to do sth对于某人来说做某事是必要的,故此处用动词不定式to take,故选B。

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