选B,unless引导时间状语从句,不能用将来时.从上下文的句意看,动作是将来,即所谓的"主将从现".
除非你明天来帮我,否则恐怕我不能在这么短的时间内收割所有的小麦.
i'm afraid i can't get in all the wheat within such a short
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