单项选择题

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

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It was your recommendation ______ enabled me to be an engineer in this world-famous company.
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______ the number in full-time employment fell by 2 million, the number of people in part-time work doubled to over 4 million.
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