Air pollution, together with overpopulation, ________many problems in big cities.

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问题 Air pollution, together with overpopulation, ________many problems in big cities.

选项 A、are causing
B、is causing
C、are caused
D、is caused

答案B

解析本题考查主谓一致。句中由together with连接了两个主语，谓语动词的单复数由第一个主语决定。air pollution应该看成单数。再根据句意判断此句的语态应为主动语态，故选B。

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成人本科学位英语

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