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
Although their lives changed, they ______ continued writing to one another.
A．ever
B．never
C．still
D．rather
单项选择题
It ______ be quite late now, we should go and catch the last bus.
A．can
B．must
C．would
D．may
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