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
We looked for a table to sit down, but they were all ().

A.reserved for
B.engaged in
C.used up
D.taken up
单项选择题
With so much work to do, John () to play games last night.

A.mustn’t go
B.wouldn’t go
C.oughtn’t to go
D.shouldn’t have got
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