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
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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
单项选择题
Passengers should ______ for flight BA125 to Berlin.
A．check in
B．check off
C．check up
D．check out
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