Three years has past.为什么“three years”可以看做单数?

Three years has past.为什么“three years”可以看做单数? Three years -- since they came to this schoolA .have past B.has passed C .has past D .have passed How time flies!Three years (_)has passedhave passedis pastare past为什么 nearly three years ( )has passed 还是 have past since i studied at this middle school The young man has written three bopks in the past two years.翻译成汉语 我想问下 He has been killed for past three years 这个句子的谓语是什么? 是不是 has been? Five years has past还是Five years have past? Tom has( )for three years There has been a large (grown)____of tourism over the past three years.请问 一下空格应该如何填写呢 连词成句been,he,the,has,to,past,many,in,three,years,countey（有一个词要有变化） In the past three years ,he ____ very hard at maths. A.works B.worked C.has worked Dis workin This bakery __ outdated bread to make new products in the past three years.B.has used C.had used in the past three years 还是 in the three years past?哪个正确? 为什么是in the past three years而不是over the past three years in the past three years是用过去完成时还是现在完成时? China_____(发展)quickly in the past three years. in the last three years和in the past three years的区别rt,尽快回答 In the past three yearsHow do you think about your school life in the past three years?What have you learnt in the past three years?