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
A man escaped from the prison last night. It was a long time ______the guards discovered what had happened.
A．before
B．until
C．since
D．when
单项选择题
The shoemaker can mend whatever______.
A．which needs mending
B．needs to be mended
C．it needs mending
D．that needs mending
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