单项选择题

His contribution to the program was ______ because 99 percent of the work was completed by his colleagues.

A．invisible
B．negligible
C．appreciable
D．considerable
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单项选择题
There a canal was being built to ______ commerce between the two countries.
A．allocate
B．facilitate
C．induce
D．furnish
单项选择题
An auction is usually advertised beforehand with full par ticulars of articles to be sold and where and when they can be viewed by ______ buyers.
A．perspective
B．prospective
C．prosperous
D．profitable
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