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【题目】________ you start doing your homework now, you will finish it before dinner.

A.IfB.UnlessC.BeforeD.Until

【答案】A

【解析】

句意:如果你现在开始做作业,你就能在晚餐前完成。

考查条件状语从句。If如果;Unless除非;Before……之前;Until直到。结合句意可知,此句是条件状语从句,由if引导,意为如果。故选A

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