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
Respect for each other's sovereignty and non-interference in each other's internal affairs ______ the fundamental principles guiding Sino-American relations.
A．confirm
B．construct
C．compose
D．constitute
单项选择题
Rejecting the urging of his physician father to study medicine, Hawking chose to ______ on math and theoretical physics.
A．impose
B．center
C．overwork
D．concentrate
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