问题
选择题
Water, _______enough, can change into vapour quickly.
A．when heated
B．heating
C．though to be heated
D．when is heated
答案
答案：A
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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Water, _______enough, can change into vapour quickly.
A．when heated
B．heating
C．though to be heated
D．when is heated
答案：A
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