2. 外语
  3. It is useful to be able to predict the extent ______ which a price change will affect supply and demon.

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

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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 题型：语法题。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extent，四个选项中能与extent构成介词短语的只有C项。
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