Air pollution, together with overpopulation, ______ many problems in big cities today.

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问题 Air pollution, together with overpopulation, ______ many problems in big cities today.

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

答案B

解析主语是air pollution，为单数形式，根据主谓一致原则，谓语用单数。together with sth．不影响主谓的搭配。

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