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Moreandmorepeoplehaverealizedwewon'thavecleanerwatertodrinkunlesssomethingsoon.A.wasdoneB.willbedoneC.tobedoneD.isdone正确答案是“D”,为什么不能选“C”?
题目详情
More and more people have realized we won't have cleaner water to drink unless something _________ soon.
A.was done B.will be done
C.to be done D.is done
正确答案是“D”,为什么不能选“C”?
A.was done B.will be done
C.to be done D.is done
正确答案是“D”,为什么不能选“C”?
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答案和解析
unless与if…not等价,如果你学过if所引导的条件壮语从句,就好办了,若选c就是if something not to be down此句就没有谓语动词,所以选D
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