Mainstream pro-market economists all agree that competition is an______ spur to efficiency and innovation.

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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：支持市场派主流经济学家认为竞争是对效率与创新的不可缺少的刺激。根据句意，只有D项indispensable“必不可少的"符合句意，故选D项。

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