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 

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.

What is the population of China?What was it in1949? it was in1949()the people'spublic of china was found填什么 为什么 it was levelled to the The activity_____(it) was fascinating 英语翻译It was a cold winter evening,an old man had don his work and was going home from the fields.On his way he saw some thing on the ground.He looked at it and found it was a snake.It was not dead,but it couldn't move because it was so cold.P How was the food on the plate?It was a() We should take a p.examination every year.It's good for our health.He was much a.We should take a p.examination every year.It's good for our health.He was much a.by the sad idea. It was built out into the sea. It was the day before Christmas翻译? it is the house (　　)he was born It was my job ( ) (clean) the classroom 翻译It was high off the ground. It was on the desk just now It was sunny all the time IT WAS E,IN THE ROOM It was lovely sitting in the it was the oldest car taking part. quite often it was the quieter翻译