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【题目】You will be out of date______you keep on studying from time to time.

A.untilB.althoughC.orD.unless

【答案】D

【解析】

句意:除非你不断地学习,否则你会落伍的。

考查连词辨析。until直到; although尽管,虽然;or否则,要不然; unless除非,如果。根据“you keep on studying from time to time.”可知,这里是unless引导的条件状语从句。根据题意,故选D

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