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 it
A.has done B.must be done
C.is doing D.was done
选B
由Yes.可知应采取些措施来处理这些污染问题,something是do的承受者,用被动语态,排除A和C,根据上下文确定用一般现在时.
应该选择B must be done 呵呵
contamination,pollution--- the differences
改错:The maths proble is too difficult.Little students can work it out .
改错:The maths proble is too difficult.Little students can work it out .请说明原因
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