单项选择题

Several companies are ______ for the contract to build the bridge.

A．asking
B．joining
C．inviting
D．bidding
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单项选择题
Very few experts ______ with completely new answers to the world's economic problems.
A．come to
B．come round
C．come up
D．come on
单项选择题
Dialogue and cooperation between the North and the South on the urgent economic problems in the world should be ______ and strengthened at all levels.
A．renewed
B．resumed
C．retained
D．rectified
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