单项选择题

The policeman kept his eyes ______on the screen of the computer to identity the criminal's footprints.

A．fixed
B．being fixed
C．fixing
D．to fix
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单项选择题
The policeman saw the thief ______he appeared on the street corner.
A．not until
B．the moment
C．as long as
D．only if
单项选择题
There is no evidence______ oil price will come down in the near future.
A．which
B．where
C．that
D．as
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