Now the pollution caused by the increasing number of cars______more and more ser

游客2023-09-19  18

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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