单项选择题

A man escaped from the prison last night. It is 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
All ______ is a continuous supply of food.
A．what is needed
B．the thing needed
C．for own needs
D．that is needed
单项选择题
The population of cities in the Eastern and Northern areas of the United States is declining while ______ southern cities is growing.
A．that in
B．that of
C．those of
D．those in
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