it was in1949()the people'spublic of china was found填什么 为什么

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it was in1949()the people'spublic of china was found填什么 为什么
it was in1949()the people'spublic of china was found
填什么 为什么 

it was in1949()the people'spublic of china was found填什么 为什么
that
强调句型 it be.that.

that
强调结构句
当被强调部分是状语时只能用that 引导后面的从句

when
时间状语从句

that,这里为强调句型,It was......that....强调句时把It was......that....去掉也能组成完整的一句话,整句句子的句意为正是在1949年中华人民共和国建立的

应该是这样:
1. it was in 1949 that the PRC was founded. (强调句型,时间前有介词)
2. it was 1949 when the PRC was founded.(时间前没介词)
More example:
it is in this hospital that i was born.
it is this hospital where i was born.