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【题目】It's necessary for you for an hour every day. It's good for your health.
A.exercise
B.wait
C.to exercise
D.to wait

【答案】C
【解析】句意:你有必要每天锻炼一个小时,这对你的健康有益。exercise锻炼;wait等候;句型:It's+形容词+for sb+to do sth 做某事对于某人来说……,it是形式主语,指代后面的动词不定式。所以此处用不定式,根据句意,所以答案是C。

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