有一道题答案 was built 对么?built前加was?为什么?

(This hotel was built in 1980.)这里的(was built)为什么不是(was build which was built for the Great Exhibition of 1851 为什么1851前不用i built in 1885,it was the oldest car taking part.请问为什么take要加i When was yuor school built? The first computer was built in USA.为什么是用built而不是building? 一道定语从句英语题Was it in this house_____was built by the father___ was built 和will be built怎样区分 Is it the park()was built built last year? 【单项选择】The building（）in 1999.A.built B.is built C.was built D Do you know when it __?A,built B,was built C,has been built The first factory was built in _____ rome was not built in a