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More often, the air in Hangzhou is dirty because of _____.
A.cornB.pollutionC.medicineD.temperature
B

试题分析:句意:因为污染,杭州的空气质量更经常地变差。because of因为,后跟名词,动名词,A.corn玉米 B.pollution 污染 C.medicine 药 D.temperature气温,空气因为污染变脏,故选B。
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