单项选择题

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
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单项选择题
The middle-aged woman is unaccustomed ______ speaking in public.
A．for
B．in
C．at
D．to
单项选择题
______ you are leaving tomorrow, we can eat dinner together tonight.
A．For
B．Since
C．Before
D．While
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