单项选择题

Paul doesn't have to be made______. He always works hard.

A．study
B．to study
C．studied
D．studying
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单项选择题
A fireman discovered the______of the fire.
A．truth
B．reason
C．cause
D．fact
单项选择题
-Nancy is not coming tonight. -But she ______
A．promises
B．promised
C．will promise
D．had promised
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