单项选择题

A pervasive negative attitude of the engineers toward projects funded by his company is the cause of the delay of signing the contract.

A．perpetual
B．pernicious
C．preventive
D．prevalent
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单项选择题
Every person on the sales team is ______ because they work together well.
A．incompatible
B．incredible
C．indefinite
D．indispensable
单项选择题
If the salesmen are not given tangible benefits for a high volume of sales, they will loose their motivation.
A．substantial
B．psychological
C．spiritual
D．profitable
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