单项选择题

He came back late, ______ which time all the guests had already left.

A．by
B．during
C．at
D．after
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I've never seen the young man ______ next to the director.
A．sits
B．sitting
C．sat
D．to sit
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
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