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【题目】You will get a toothache _____________ you clean your teeth regularly.

A.unlessB.whenC.thoughD.because

【答案】A

【解析】

句意:除非你经常刷牙,否则你会牙疼的。

考查连词辨析。unless除非;when当……时候;though虽然、尽管;because因为。根据语境:你会牙疼的,……你经常刷牙。可知此处表达的是“除非”,所以应用unless,其它选项均语意不通,故答案选A

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