【題目】【2016安徽省馬鞍山市模擬】— Will we have cleaner water to drink in the future?

— Well, I don’t think we will unless something _______.

A. is done B. was done C. has done D. had done

【答案】A

【解析】

試題分析：句意：--在將來(lái)我們將有更干凈的水可喝嗎？--嗯，我認(rèn)為我們將不會(huì)有除非我們做一些事情。根據(jù)主語(yǔ)和謂語(yǔ)動(dòng)詞之間的動(dòng)賓關(guān)系，可知用被動(dòng)語(yǔ)態(tài)，在條件狀語(yǔ)從句中主句用將來(lái)時(shí)態(tài)，從句用一般現(xiàn)在時(shí)，故選A。

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