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【题目】________you start a task,you must finish it on time.

A.UnlessB.UntilC.ThoughD.Once

【答案】D

【解析】

句意:你一旦开始一件任务,就必须把它完成。

考查连词。A. Unless除非;B. Until直到;C. Though尽管;D. Once一旦。观察句子逻辑关系,应该是“Once一旦”,故选D

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