单选题Now the pollution caused by the increasing number of cars _____ more and more serious in many cities.A becomeB becameC is becomingD had become

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单选题

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

A

become

B

became

C

is becoming

D

had become

参考答案

参考解析

解析：
本题考查现在进行时。句意：现在，车辆增加所造成的污染在很多城市变得越来越严重。由本句开头的“now”可知，本句应用现在时。故C项为正确答案。

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