【題目】Unless we ______ the problem,we won't be happy.

A.solve B.will solve

C.solved D.solving

【答案】A

【解析】

試題分析:句意:如果我們不解決這個(gè)問題,我們就不會(huì)高興。unless引導(dǎo)的條件狀語從句用一般現(xiàn)在時(shí),主句用一般將來時(shí),故選A。

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