单项选择题

The star has been playing basketball ______ he was a boy.

A．during
B．when
C．since
D．as
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单项选择题
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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