It is useful to be able to predict the extent______ which a price change will af

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问题 It is useful to be able to predict the extent______ which a price change will affect supply and demon.

选项 A、from
B、with
C、to
D、for

答案 C

解析从本句结构我们可以看出，本句空格后边的部分是“prep．+rel．pron．(which)”引导的定语从句，修饰主句中的先行词ecten，四个选项中能与extent构成介词短语的只有C项。

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