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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My little son has not learned how to ______ the time yet.
A．see
B．know
C．understand
D．tell
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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