Mainstream pro-market economists all agree that competition is an______spur to e

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问题 Mainstream pro-market economists all agree that competition is an______spur to efficiency and innovation. (厦门大学2014年试题)

选项 A、extravagant
B、exquisite
C、intermittent
D、indispensable

答案 D

解析句意为：市场派主流经济学家认为竞争是对效率与创新不可缺少的刺激。根据句意，只有D项indispensable“必不可少的”符合句意。

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