单项选择题
The number of such vehicles（）steadily increasing.
A.have been
B.had been
C.having been
D.has been
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The casual attitude in the US does not mean（）no hierarchy in US companies.
A.that is
B.there is
C.there are
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Religion, politics or ethnic background should be touched on（）.
A.cautiously
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C.cautious
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The negotiation will（）in a well-prepared, calm and pragmatic manner, all laced（）a substantial dose of humor.
A.proceed; with
B.process; with
C.process; in
D.proceed; in
