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
I really can't figure _________ who the person that phoned me just now was.
A．out
B．from
C．at
D．out of
单项选择题
I have no idea what Mary _________ at this time tomorrow.
A．will be doing
B．is doing
C．will do
D．does
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