【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(wèn)題，我們就不會(huì)高興。unless引導(dǎo)的條件狀語(yǔ)從句用一般現(xiàn)在時(shí)，主句用一般將來(lái)時(shí)，故選A。

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