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【题目】You shouldn’t accept a lift from a person ________ you don’t know him.

A. until B. unless C. if D. whether

【答案】C

【解析】

试题分析:句意:你不应该接受一个人搭车,如果你不了解他。 A. until直到才;B. unless除非;C. if如果;D. whether是否。故选C

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