regular exercise is very important.It’s never a good idea to exercise too close to bedmme.
A．IfB．AsC．Although D．Unless
C【命題動向】考查狀語從句。
解析一：前后句子在邏輯上是轉(zhuǎn)折關(guān)系，所以用Although。句意是“盡管有規(guī)則的鍛煉非常重要，但是離睡覺時間太近的鍛煉從來不是一個好主意。
解析二：本題句意為：“盡管有規(guī)律的進行鍛煉是非常重要的，但太接近就寢時間的鍛煉亦不可取。"從句與主句之間明顯存在讓步轉(zhuǎn)折關(guān)系，四個選項中只有C選項“although”可以引導正常語序的讓步狀語從句，故為正確答案。
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