只能用of,用which不正确.
因为用which的话就是用which引导一个定语从句 “which the air pollution in cities”,而这个句子是没有谓语的,所以不正确.
Th problem which the air pollution in cities has become more
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相关问题
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The problem of air pollution is becoming more serious ______
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Now the air pollution in this city ( ) more and more serious
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The air pollution has become( )concern for
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Air pollution is___most serious problem in many major cities
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Air pollution is___most serious problem in many major cities
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the population problem has become more serious in developing
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为什么在The ____problem of our city is air pollution.中不能用worst?
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The pollution problem in this area ___(become) worse and wor
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It is urgent that the acute problem of air pollution in the
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as air pollution has beengreatly reduced,this city is still-