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
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单项选择题
--I am sorry to put you to so much trouble. -- ______ .
A．That's all right
B．All right
C．Don't mention it
D．Not next-time
单项选择题
It was for this reason ______ she left her homeland and moved to a mountain village.
A．why
B．for
C．which
D．that
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