________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(gè)句子在說(shuō)經(jīng)常鍛煉的好處，第二句子則說(shuō)快要睡覺(jué)時(shí)鍛煉是不好的，由此可知二者之間存在轉(zhuǎn)折或讓步關(guān)系。if“如果”，引導(dǎo)條件狀語(yǔ)從句；as“當(dāng)……的時(shí)候”，引導(dǎo)時(shí)間狀語(yǔ)從句，雖然as還有“雖然，盡管”的含義，可用來(lái)引導(dǎo)讓步狀語(yǔ)從句，但此時(shí)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(dǎo)讓步狀語(yǔ)從句；unless“如果不，除非”，引導(dǎo)條件狀語(yǔ)從句。句意：雖然經(jīng)常鍛煉是很重要的，但是快到睡覺(jué)的時(shí)間鍛煉絕不是一個(gè)好主意。故選C項(xiàng)。

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