问题描述：
.九年级英语句型转换改为被动语态,
1.Wu must plant trees every year.
2.Will Mary sweep the loor?
3.Mary is going to wash the dishes
4.Tom has cleaned his room
5.A friend is playing the piano
1.Wu must plant trees every year.
2.Will Mary sweep the loor?
3.Mary is going to wash the dishes
4.Tom has cleaned his room
5.A friend is playing the piano
问题解答：
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