2. 专升本
  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.

admin2019-10-28  12
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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