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【题目】Water turns into steam ________ it boils.

A.whenB.untilC.althoughD.while

【答案】A

【解析】

句意“当水烧开时,水会变成蒸汽”。

when当……时候,从句的动作和主句的动作可以同时发生也可以是先后发生;B.直到(引导时间状语从句);C.尽管(引导让步状语从句);D.当……时候,强调主句的动作在从句动作发生的过程中或主从句两个动作同时发生。根据句意可知,水先烧开,然后变成蒸汽,故选A

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