单项选择题

Many things have happened ______ I saw you.

A．when
B．before
C．since
D．for
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单项选择题
It's high time we ______ something to stop air pollution.
A．are doing
B．did
C．have to do
D．must do
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
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