2. 专升本
  3. Air pollution, together with overpopulation, ______ many problems in big cities.

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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