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5. Once      ,water will become gas. (heat)

一旦加热到足够高的温度,水会变成气体。

5. (it is) heated to a high enough temperature考查once 引导的状语从句的运用。once从句为条件状语从句,从句谓语动词只能用一般时代替相应的将来时,且当从句中谓语动词含be而主语与主句相同时,从句中的主语和be都可省略。具有类似用法的结构还包括when,while,before,after,if, unless,though等引导的状语从句。 

题目来源:高考丢分题英语 > Unit 3 Travel journal

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