When water ( ),it will be changed into vapour.A.is heated B.heating C.has heated D.heats选择一个正确答案

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When water ( ),it will be changed into vapour.
A.is heated B.heating C.has heated D.heats
选择一个正确答案

A.is heated
当水被加热,它会变成气体.

A

is heated

A,表示被动,水被加热

c.
heated (过去式)前面要用has.