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
I have heard both teachers and students ______well of him.
A．to speak
B．spoken
C．to have spoken
D．speak
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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