It was in 1949 ___new china was founded.为什么要填when,怎么样才能填that难道这句不是强调句吗

It was back in 1853. It was built in 1078. it was in 1949 that China was founded .这句话的 状语是什么 it was in 1949 _ China regained it independence.whenwhichthenthat给出正确答案并给出理由 It was in 1949___the People's Republic of China was founded.A.whenB.thatC.in whichD.which 英语翻译It was shipped in expectation that . It was cold there e______ in summer. IT WAS E,IN THE ROOM It was lovely sitting in the Perhaps interested in it was a It was said in the book it was sunday morning in may . when it was () he was careless () he failed in the eaxm It was in this wood ____the wolf was killed. 英语翻译It was as though it stayed behind in marketplace. no,it wasn't.yes,it was.的意思是什么was it in the wardrobe? it was in 1949 ___ China was founded.知道是强调句要填that,但为什么填which和when不行,错在哪里?it was in 1949 which China was founded 语法哪里错 when was our party founded.It was founded-When was our party founded?-it was founded_A.on October 1,1949 B.in May 1922 C.on july 1,1921 D.in August,1927