单项选择题

Most of the hostages ________ after the both sides reached an agreement.

A．released
B．were released
C．relieved
D．were relieved
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单项选择题
She is in a bad mood; she must have been ________ by something.
A．put out
B．put over
C．put down
D．put forward
单项选择题
The program has helped Chinese and American scholars ________ friendship and learn about each other's culture.
A．cement
B．stiffen
C．straighten
D．establish
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