单项选择题

The policeman saw the thief ______ he appeared on the street comer.

A．not until
B．as long as
C．the moment
D．only if
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单项选择题
We don't deny that your products are superior in quality to ______ of Japanese make.
A．the one
B．that
C．these
D．those
单项选择题
______ his surprise, the manager found nobody in the meeting room.
A．At
B．To
C．For
D．With
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