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【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：--在將來我們將有更干凈的水可喝嗎？--嗯，我認為我們將不會有除非我們做一些事情。根據(jù)主語和謂語動詞之間的動賓關系，可知用被動語態(tài)，在條件狀語從句中主句用將來時態(tài)，從句用一般現(xiàn)在時，故選A。

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