单项选择题

The conference has been held to discuss the effect of tourism ______the wildlife in the area.

A．in
B．on
C．at
D．with
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单项选择题
-How long are you staying -I don't know．______．
A．That's OK.
B．Never mind.
C．It depends.
D．It doesn't matter.
单项选择题
Stand over there ______you'll be able to see it better.
A．or
B．while
C．but
D．and
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