Question

【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

Answer 1

【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。