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
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
单项选择题
The book is ______ boring; it is, in fact, rather exciting and fascinating.
A．anything but
B．nothing but
C．no more
D．all but
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