问题描述：
this pair of trousers ( ) dirty,you can't put( )on A.is,it B..are,them C.is,them
this pair of trousers ( ) dirty,you can't put( )on
A.is,it B..are,them C.is,them
this pair of trousers ( ) dirty,you can't put( )on
A.is,it B..are,them C.is,them
问题解答：
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