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【题目】___ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.

A. It B. As C. Although D. Unless

【答案】C

【解析】although“尽管”; As “如”; Unless “除非”。句意为:尽管有规律的运动很重要,但是在睡前运动不是一个好主意。

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