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
You've got it on the ______.
A．knot
B．bottleneck
C．button
D．right
单项选择题
I ran ______ one of my former classmates, who was on her way to see me.
A．up
B．out of
C．over
D．into
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