单项选择题

The patient's intelligence has been ______ by a brain injury.

A．spoiled
B．marred
C．impaired
D．undermined
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单项选择题
Once ______, the information superhighway will drastically change the lifestyle of all the residents on this island.
A．it being completed
B．it completed
C．completed
D．it completes
单项选择题
His ambition led him to ______ the career of Edmund Burke.
A．rival
B．compete
C．vie
D．emulate
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