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
Jane is the only student in the class ______ got full marks in the exam.
A．which
B．whose
C．that
D．whom
单项选择题
Because of the reduction of air pollution, this city now is a good place ______ .
A．where to live
B．which to live
C．to live in
D．to be lived
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