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
They had the greatest difficulties ______ during the journey to Antarctica.
A．imaginary
B．imaginative
C．imaginable
D．imaginal
单项选择题
He knows the regulations, and if he refuses to ______ with them he must take the consequence.
A．accord
B．assist
C．confirm
D．comply
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