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 当主语是together with,with,along with,as well as连接的并列主语时,谓语动词要和第一个主语保持一致。本句的主语是air pollution,所以谓语动词应用单数形式,所以可排除选项A、C。又因air pollution和problems不存在动宾关系,所以可排除选项D。故选B。
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