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 根据句中的时间状语Now可知,本句应用现在进行时,表示现在、目前或现阶段正在进行的动作或发生的事情。故选C。
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本试题收录于: 英语题库普高专升本分类
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