单项选择题

When and where the meeting will be held ______ a mystery.

A．to remain
B．remain
C．remains
D．is remaining
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单项选择题
Between 1974 and 1997, the number of overseas visitors expanded ______ 27%.
A．by
B．for
C．to
D．in
单项选择题
Do you have any ______ of success
A．access
B．accident
C．possibility
D．opportunity
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