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 are all for your proposal that the discussion
A．be put off.
B．was put off
C．should put off
D．is to put off
单项选择题
In general, the amount that a student spends for housing should be held to one-fifth of the total ______ for living expenses.
A．acceptable
B．available
C．advisable
D．applicable
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