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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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
An old friend of mine from abroad, ______ I was expecting to stay with, telephoned me from the airport.
A．who
B．whom
C．that
D．which
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