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
问题描述：
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
答
is heated
答
A，表示被动，水被加热
答
c.
heated （过去式）前面要用has.
答
A
答
A.is heated
当水被加热,它会变成气体.