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【题目】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:众所周知,除非你经常锻炼,否则你不会保持健康。

A. unless除非,B. since自从,C. if如果,D. although尽管。根据句意,前一句应该是后一句内容产生的条件,AC都表条件,故排除BD,但是如果选C,便于常识不符合,故选A

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