单项选择题

______ these circumstances, you might agree with us that it is rather difficult for your products to put a footing on this market.

A．On
B．At
C．Under
D．Over
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We have been told that under no circumstances ______ the telephone in the office for personal affairs.
A．may we use
B．we may use
C．we could use
D．did we use
单项选择题
The middle-aged woman is unaccustomed ______ speaking in public.
A．for
B．in
C．at
D．to
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