问题标题:
【Theclassroomisverydirtytoday.Itishard_______.A.cleaningB.tocleanitC.tocleaningD.toclean】
问题描述:

Theclassroomisverydirtytoday.Itishard_______.

A.cleaning B.tocleanit C.tocleaning D.toclean

陈华艳回答:
  D
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