题目内容
( ) 4. We can see litter here and there in the yard. Every one of us should play a part in .
A. clean them up B. clean it up
C. cleaning them up D. cleaning it up
D
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题目内容
( ) 4. We can see litter here and there in the yard. Every one of us should play a part in .
A. clean them up B. clean it up
C. cleaning them up D. cleaning it up
D