单项选择题

Research findings show we spend about two hours dreaming every night, no matter what we______ during the day.

A．should have done
B．would have done
C．may have done
D．must have done
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单项选择题
We need a chairman ______.
A．for whom everyone has confidence
B．in whom everyone has confidence
C．who everyone has confidence of
D．whom everyone has confidence on
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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