单项选择题

My little son has not learned how to ______ the time yet.

A．see
B．know
C．understand
D．tell
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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
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
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