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
Is that a book on fanning If so, I want to borrow ______.
A．this
B．one
C．it
D．the one
单项选择题
He hurried out of the classroom______ the class was over.
A．a moment ago
B．the moment
C．at the moment
D．the moment that
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