单项选择题

Difficulties and hardships have ______ the best qualities of the young geologist.

A．brought about
B．brought forth
C．brought out
D．brought up
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单项选择题
After a prolonged siege, the town was rendered up to the ______.
A．agitators
B．instigators
C．insurgents
D．delinquents
单项选择题
My task boils down to industrial ______ and trouble shooting.
A．contact
B．intimacy
C．liaison
D．involvement
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