单项选择题

Your mother must be at home, ______she

A．mustn't
B．doesn't
C．isn't
D．needn't
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单项选择题
______arriving at the spot, the policemen at once helped the passengers to safety.
A．At
B．On
C．The moment
D．As
单项选择题
—I am sorry to put you into so much trouble. —______.
A．That's all right
B．All right
C．Don't mention it
D．Not next time
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