单项选择题

It is the responsibility of the police to ___________ law and order in the city.

A．retain
B．restrain
C．remain
D．maintain
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单项选择题
The speaker _________ the need for helping the drop-out children back to school.
A．satisfied
B．highlighted
C．projected
D．strengthened
单项选择题
The reporters _________ the corruption of several high officials in the government, consequently, they had been asked to resign from office.
A．discovered
B．displayed
C．exposed
D．presented
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