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.

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

答案 D

解析句意为：主流的亲市场派经济学家认为竞争是对效率与创新的不可或缺的刺激。根据句意，只有D项indispensable“必不可少的”符合句意，故选D项。

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