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【题目】(题文)Unless he ______ the problem, he won't be happy.

A. solve B. will solve C. solves

【答案】C

【解析】

句意:除非他解决了这个问题,否则他不会高兴的。考查动词时态辨析题。本句是unless引导的条件状语从句,时态需用“主将从现”。he是单数第三人称,动词需用三单形式;根据句意语境,可知选C。

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