when television was first introduced ,the extent _____ it wo

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when television was first introduced ,the extent _____ it would affect society could not have been foreseen.
答案给的这空填to which 为什么?解释一下句子成分什么的被?
后半句写成to which the extent it would affect society could not have been foreseen.
可以不?如果不可以,为什么?

我觉得要改写应该也是 to what extent 吧,你说得听起来好奇怪

when television was first introduced ,the extent _____ it wo When television was first introduced into American society . When first introduced in the market,these products enjoyed g when televisions were first introduced 1.The cat was _____(die) when I found it. He _____ the Huangpu River yesterday .It was his first _____ 英语翻译it was the effect of the goats introduced to the islands 完成句子:When I met him the other day ,it was the first time tha It was nine years ago,when I went to the UK for the first ti Who invented the first television?（改为被动语态）___ ___ was the fi When was the first Earth Day celebated? When was the saying first used?翻译