单项选择题

A fireman discovered the______of the fire.

A．truth
B．reason
C．cause
D．fact
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单项选择题
-Nancy is not coming tonight. -But she ______
A．promises
B．promised
C．will promise
D．had promised
单项选择题
Great men never give up______difficulty.
A．in a face of
B．in face of the
C．in the face of
D．in the face of the
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