Great changes___in the city,and a lot of factories have been set up.是填has been happened还是have happened?为什么?

Great changes___in our country during the past 20 years.A.have happened B.happenedC.have been happened D.were happened Great changes___in the last ten years in China.A.took place B.have taken place C.were taking place D.had taken place Great changes___in the city,and a lot of factories have been set up.是填has been happened还是have happened?为什么? wouldn't that be great Isn't it great翻译 1.By the time you get back,great changes___in this area.为什么用问will have taken place?2.On his next birthday he __marries for ten years.用will have been 为什么不用has been?3.john _____now for the light in his room is still on .为什么 A great soccer player can't make a great t____ isn't it great fun?英语翻译 great的同义词是什么?以t开头 Bill Gates is a great computer [t ] Wasn't that a great talent show? G R E A T great是什么意思 great great great Great great Great