单项选择题

It is useful to be able to predict the extent _______ which a price change will influence supply and demand.

A．from
B．with
C． to
D．for
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单项选择题
He never _______ to his customers in his business except occasionally for some special reasons. This time he cut the price by half, which really shocked me.
A．leaked
B．drew
C．quoted
D．yielded
单项选择题
That was so serious a matter that I had no choice but _______ the police.
A．called in
B．calling in
C．call in
D．to call in
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