单项选择题

Our company will hire a new research ______ to develop our new product A-220, an upgraded version of A-210.

A．assistant
B．assisted
C．assistance
D．assistantship
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单项选择题
If the marketing director is dissatisfied with your marketing proposal, you should ______ revise it or establish a new one.
A．neither
B．both
C．however
D．either
单项选择题
Advances in electric vehicle technology have major ______ for health, wealth, and environment in the coming decades.
A．explanations
B．references
C．implications
D．uses
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