The pollution problem here seems to get more and more serious.Yes.Something ___________ with itA.has done B.must be doneC.is doing D.was done
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![The pollution problem here seems to get more and more serious.Yes.Something ___________ with itA.has done B.must be doneC.is doing D.was done](/uploads/image/z/5779654-70-4.jpg?t=The+pollution+problem+here+seems+to+get+more+and+more+serious.Yes.Something+___________+with+itA.has+done+B.must+be+doneC.is+doing+D.was+done)
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