单项选择题

I've never seen the young man ______ next to the director.

A．sits
B．sitting
C．sat
D．to sit
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单项选择题
By the time you get there tomorrow, they ______ for Beijing.
A．will have left
B．are leaving
C．will leave
D．are to leave
单项选择题
The clock, ______ my great grandfather bought, is still in good order.
A．which
B．that
C．as
D．who
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