2. 外语
  3. Now the pollution caused by the increasing number of cars______more and more serious in many cities.

Now the pollution caused by the increasing number of cars______more and more serious in many cities.

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问题 Now the pollution caused by the increasing number of cars______more and more serious in many cities.
选项 A、become
B、became
C、is becoming
D、had become
答案C
解析 题干中的Now一词提示本句应使用现在时态；分析句子成分可知，主语是the pollution，故空格处应填入动词的第三人称单数形式作谓语，所以选项C)为本题的正确答案。
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