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.(2014年厦门大学考博试题)

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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