将句子改成被动语态(高一英语)
1.thedoctorsaretreatinghisfatherinaSARA-designatedhospital.
2.heisreadingabookwhenIcomeintohisofficel.
3.Aretheygoingovertheirlessonswhentheteachercomesintotheroom.
4.Whatistheheadmasterdoingnow.
5.Thestudentsare'tplayingbasketball,buttheyareplayingfootballontheplayground
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