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
His opinion was quite ______ so we had to give up persuading him.
A．clear
B．apparent
C．evident
D．obvious
单项选择题
It is useful to be able to predict the extent ______ which a price change will affect supply and demand.
A．from
B．with
C．to
D．for
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