问题标题:
【把Thestudenthadcleanedtheclassroombeforetheteacher'sarrival改为被动句】
问题描述:

把Thestudenthadcleanedtheclassroombeforetheteacher'sarrival改为被动句

牛晨回答:
  theclassroomhadbeencleanedbeforetheteacher'sarrival
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