Now the air pollution in this city _____ more and more serious with each passing day.
A. to become
B. became
C. becoming
D. is becoming
A. to become
B. became
C. becoming
D. is becoming
【答案】
A. to become
B. became
C. becoming
D. is becoming
A. to become
B. became
C. becoming
D. is becoming
【答案】
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