Mainstream pro-market economists all agree that competition is an（）spur to efficiency andinnovation.
考试：MBA考试
科目：英语（在线考试）
问题：
A：extravagant
B：exquisite
C：intermittent
D：indispensable
答案：
解析：
相关标签：
Mainstream pro-market economists all agree that competition is an（）spur to efficiency andinnovation.
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