____ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.
A．ItB．AsC．AlthoughD．Unless
C
although“盡管”; As “如”; Unless “除非”。句意為：盡管有規(guī)律的運(yùn)動很重要，但是在睡前運(yùn)動不是一個好主意。
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