单项选择题
Although recent years have seen（）reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing.
A.substantial
B.substance
C.submit
D.subjective
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相关考题
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单项选择题
The number of such vehicles（）steadily increasing.
A.have been
B.had been
C.having been
D.has been -
单项选择题
The casual attitude in the US does not mean（）no hierarchy in US companies.
A.that is
B.there is
C.there are
D.that are -
单项选择题
Religion, politics or ethnic background should be touched on（）.
A.cautiously
B.cautiousness
C.cautious
D.caution
