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
Little ______ that the police are about to arrest him.
A．he knows
B．he doesn' t know
C．does he know
D．doesn' t he know
单项选择题
Tom works very hard. His brother, ______ , doesn' t do much at all.
A．what' s more
B．on the other hand
C．for one thing
D．even worse
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