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