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
______ evidence that language-acquiring ability must be stimulated.
A．There being
B．If being
C．It is
D．There is
单项选择题
The ship took machines and other goods back to the port ______ it had set off.
A．from which
B．to which
C．which
D．in which
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