It was October _when__ the People’s Republic\x0b of China was foundedIt was October __when_ the People’s Republic\x0b of China was foundedIt was in October__that_ the People’s Republic\x0b of China was founded.为什么
问题描述：
It was October _when__ the People’s Republic\x0b of China was founded
It was October __when_ the People’s Republic\x0b of China was founded
It was in October__that_ the People’s Republic\x0b of China was founded.
为什么
答
*成立于十月
这里是一个强调句，It was ~~~when 的句型
答
when
这是定语从句,做时间状语
答
第一个句子：It was October when ...这里的 when 引导定语从句,修饰 October,全句直译是：那是*成立的十月.（当然,此句需要意译才会更通顺）.
第二个句子：It was in October that ...是一个 it was...that 的强调句型,它的陈述句是 The People's * was founded in October. 改成强调句型后不能漏掉陈述句中的任何一个成分,因此需要完整的状语 in October.
答
前一个是定语从句，修饰时间用关系词when。后一个是强调句，句型是It is/was …that …，这里是介词短语。