单项选择题

It is useful to be able to predict the extent ______ which a price change will affect supply and demon.

A. from
B. with
C. to
D. for

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单项选择题

The students was just about to ______ the question, when suddenly he found the answer.

A. arrive at
B. submit
C. work out
D. give up

单项选择题

I told him how to get there, but perhaps I ______ him a map.

A. should have given
B. ought to give
C. had to give
D. must have given

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