单项选择题

Students always keep candles in their rooms（）there is a power cut.

A．in case
B．in no case
C．in the case of
D．in case of

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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．with
B．from
C．for
D．to
单项选择题
Do yon remember（）Professor Fan during your last visit

A．introducing
B．being introduced to
C．to have introduced to
D．to be introduced to
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