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
______ you are leaving tomorrow, we can eat dinner together tonight.
A．For
B．Since
C．Before
D．While
单项选择题
Johnson preferred ______ heavier work to do.
A．to be giving
B．to have given
C．to be given
D．having given
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