单项选择题

Only when he had done it （） that he had made a mistake.

A．he then realized
B．did he realize
C．before he realized
D．he realized

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单项选择题
Immigrants of all races in this area are demanding that they receive （） treatment from the authorities.

A．unique
B．united
C．uniform
D．universal
单项选择题
When he finished all the items on the test paper, he （） the answers carefully.

A．saw through
B．got over
C．went over
D．looked into
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