Water, enough, can change into vapour quickly. A. when heatedB. heatingC. though to be hea

发布时间：2020-08-17 11:59:22

Water,     enough, can change into vapour quickly.
A. when heated
B. heating
C. though to be heated
D. when is heated

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(答案→)A. when heated
B. heating
C. though to be heated
D. when is heated
解析：该题是被动语态的状语从句的省略形式，补完整为：when it is heated
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