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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

C解析:第一個句子在說經常鍛煉的好處,第二句子則說快要睡覺時鍛煉是不好的,由此可知二者之間存在轉折或讓步關系。if“如果”,引導條件狀語從句;as“當……的時候”,引導時間狀語從句,雖然as還有“雖然,盡管”的含義,可用來引導讓步狀語從句,但此時從句必須用倒裝,即把名詞、形容詞等提到as的前面;although“雖然,盡管”,引導讓步狀語從句;unless“如果不,除非”,引導條件狀語從句。句意:雖然經常鍛煉是很重要的,但是快到睡覺的時間鍛煉絕不是一個好主意。故選C項。

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