单选题Although recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles().Ahave been steadily increasingBhas been steadily increasedChas been steadily increasingDhave been steadily increased
单选题
Although recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles().
A
have been steadily increasing
B
has been steadily increased
C
has been steadily increasing
D
have been steadily increased
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