单项选择题

Nonwovens usually consist of at least two ______: the fiber and the binder.

A．opponents
B．components
C．complements
D．compliments
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单项选择题
Several companies are ______ for the contract to build the bridge.
A．asking
B．joining
C．inviting
D．bidding
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
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