it is over _______years since our Party was founded in 1921.a.seventyb.ninetyc.eightyd.eightieth答案应该是什么,请说明理由!

It is over to what is it over It is over 什么意思? It is over t（） I know it is over It is over between us. it is over duty to master it what time is it over?里面的over是什么词性 what time is it over 意思 It is over there的中文是什么 it's all over,l is 蔡健雅《is it over now》的歌词? Is it really over now?怎么翻译 where is the elephant?it”s over Is it over there?(作肯定回答) it is well over my head Don't cry because it is over. It is over 30 meters.It is ( ) ( ）30 meters.