问题
选择题
When television was first introduced, the extent _______ it would affect society could not have been foreseen.
A．of which
B．of what
C．to which
D．in which
答案
答案：C
题目分析：考查定语从句：句意：当电视一开始被引入的时候，它对世界会有什么影响程度不可能被预见的，考的是“介词关系代词”中介词的选择问题。To …extent意思为“在…程度上”。所以用to which引导定语从句，选C。