单项选择题

Depending on the outcome of negotiations, Caspian Air （）offer flights to Berlin and Copenhagen from Kova Airport.

A. be
B. has
C. did
D. may

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（）number of students have gone to Shanghai.

A. /
B. The
C.A
D. An
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Billboards, graffiti, trash, and tangled telephone wires can （）to visual pollution.

A. contribute
B. contribution
C. contributive
D. contributable
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