InthepoorpartsofAmerican’sbigcitie

发布时间：2020-07-27 00:10:04

In thepoor parts of American’s big cities there is a lot of crime, ________.A.and much of which is seriousB.much of which is seriousC.so much of it is seriousD.much of that is serious

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B解析用which就是一个定于从句，前面不应该用连词；若用it则要用连词。
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