单项选择题

--Is Mrs White in the office --Yes, ______ she is on duty, she must be there.

A．since
B．until
C．for
D．if
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单项选择题
What does the woman mean
A． He speaks too fast.
B． He speaks too slowly.
C． He doesn’t speak to the point.
单项选择题
What’s the problem
A． The man can’t drive,
B． They are lost.
C． The conference is over.
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