单项选择题

As ______ clear from his manners, he is a teacher.

A．being
B．is
C．to be
D．been
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单项选择题
I know you think I'm talking nonsense, but ______ you will realize I am right.
A．at one time
B．in time
C．at times
D．on time
单项选择题
The guests ______ of their rooms in the morning and left.
A．check in
B．check over
C．checked out
D．checked through
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