It is useful to be able to predict the extent______which a price change will affect supply and demand.

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问题 It is useful to be able to predict the extent______which a price change will affect supply and demand.

选项 A、from
B、with
C、to
D、for

答案C

解析考查固定搭配。这是一个“介词+关系代词which”引导的定语从句。从句中包含一个固定搭配to the extent“到……程度”，将介词to提到关系代词which前就形成了现在的结构。句意为“能预测物价变化对供求的影响程度是很有用的”。

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