单项选择题

Mike was walking along the street ______ he ran into an old friend.

A．when
B．who
C．which
D．whom
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单项选择题
You ______ leave now, because there is an all-night bus.
A．mustn’t
B．don't have to
C．aren't able to
D．can't
单项选择题
Although their lives changed, they ______ continued writing to one another.
A．ever
B．never
C．still
D．rather
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