More and more teachers and parents have noticed another kind of pollution,____ came from the printed papers sold on streets.A、 it  B、 that  C、 which  D、 this pollution 

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Moreandmoreteachersandparentshavenoticedanotherkindofpollution,____camefromtheprintedpaperssoldonstr

More and more teachers and parents have noticed another kind of pollution,____ came from the printed papers sold on streets.A、 it  B、 that  C、 which  D、 this pollution 
More and more teachers and parents have noticed another kind of pollution,____ came from the printed papers sold on streets.A、 it  B、 that  C、 which  D、 this pollution 

More and more teachers and parents have noticed another kind of pollution,____ came from the printed papers sold on streets.A、 it  B、 that  C、 which  D、 this pollution 
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