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
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单项选择题
A body weighs ______ from the surface of the Earth.
A．less the farther it gets
B．the farther it gets, the less
C．less than it gets farther
D．less than it, the farther it gets
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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