they don't know_____(怎么)to do with the waste paper

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they don't know_____(怎么)to do with the waste paper

they don't know_____(怎么)to do with the waste paper
they don't know_____(怎么)to do with the waste paper

they don't know_____(怎么)to do with the waste paper
they don't know___what__(怎么)to do with the waste paper
what to do with=how to do
希望能够帮到楼主

what