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
This suitcase is ______ heavy for me to carry.
A．enough
B．very
C．so
D．too
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
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