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When_______,waterwillbeturnedintosteam.

A、heated
B、heating
C、beingheat
D、havingheated
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正确答案:

A

答案解析:

水被加热时会变成蒸汽。因为主句主语 water 和从句谓语 heat 的关系是被动的,所以用过去分词。

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