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

A. solve B. will solve C. solves

【答案】C

【解析】

句意:除非他解決了這個問題,否則他不會高興的。考查動詞時態(tài)辨析題。本句是unless引導(dǎo)的條件狀語從句,時態(tài)需用“主將從現(xiàn)”。he是單數(shù)第三人稱,動詞需用三單形式;根據(jù)句意語境,可知選C。

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