regular exercise is very important.It’s never a good idea to exercise too close to bedmme.

问题补充：

regular exercise is very important.It’s never a good idea to exercise too close to bedmme.

A. It

B. As

C. Although

D. Unless

答案：

A. It

B. As

(答案→)C. Although

D. Unless

解析：这题考查连词：句意是：虽然定期锻炼很重要，但是太接近睡觉时间不是好主意。选C。

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