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
A．Of course not.B．Please close the door.C．Is it coldD．Please don’t close the door.
A．Of course not.
B．Please close the door.
C．Is it cold
D．Please don’t close the door.
单项选择题
I didn' t hear the sound, so I ______ asleep.
A．must be
B．must have been
C．should be
D．should have been
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