问题
选择题
________ regular exercise is very important, it's never a good idea to exercise too close to bedtime.[ ]
A. If
B. As
C. Although
D. Unless
答案
答案：C
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________ regular exercise is very important, it's never a good idea to exercise too close to bedtime.[ ]
A. If
B. As
C. Although
D. Unless
答案：C