单项选择题

Everyone should ______ the danger of smoking.

A．aware that
B．be aware of
C．aware of
D．be aware that
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单项选择题
The 01d man was found ______ in his bed, .sound asleep.
A．lying
B．lie
C．lay
D．lain
单项选择题
He ought to have handed in the paper yesterday. That's what he ______.
A．should do
B．should be doing
C．should have done
D．should
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