【題目】It is known to us all that ______ you exercise regularly, you won’t keep good health.

A.unlessB.sinceC.ifD.although

【答案】A

【解析】

句意:眾所周知,除非你經(jīng)常鍛煉,否則你不會保持健康。

A. unless除非,B. since自從,C. if如果,D. although盡管。根據(jù)句意,前一句應(yīng)該是后一句內(nèi)容產(chǎn)生的條件,AC都表條件,故排除BD,但是如果選C,便于常識不符合,故選A。

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