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
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单项选择题
His ambition led him to ______ the career of Edmund Burke.
A．rival
B．compete
C．vie
D．emulate
单项选择题
They are talking vigorously about the people and countries ______ they had visited.
A．which
B．that
C．what
D．where
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