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It never will rain roses. __________ we want to have more roses. we must plant trees.

A.When B.Unless C.Until D.While

A

解析试题分析:句意:天上不会掉下玫瑰来,如果想要更多的玫瑰,必须自己种植。这里用when“当…时候,如果”,unless“除非,如果不”,until“直到”,while“当…时候,然而,虽然”,根据句意选A。
考点:考查连词辨析

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