单项选择题

Standing beside the desk _________.

A．the secretary was
B．did the secretary be
C．was the secretary
D．did the secretary was
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单项选择题
Nobody but Jack and Smith _________ in the office yesterday.
A．had been
B．was
C．were
D．is
单项选择题
_________ we all know, Mr. Wang is a very warm-hearted person.
A．Which
B．That
C．As
D．It
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