It is known to all that         you exercise regularly , you won’t keep good health .

    A．unless         B．whenever       C．a(chǎn)lthough       D．if

A 

解析：此題考查了連詞的用法。unless相當于if …not，引導(dǎo)條件狀語從句。其他選項均不含否定的假設(shè)，用于此處都不合適。

 

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