cai lun,a famous chinese inventor,invented paper in AD105,but ------many other timesA failed B had failed答案选B,请问为什么,选A我可以说是失败很多次是个过去的事实呀

cai lun,a famous chinese inventor,invented paper in AD105,but ------many other timesA failed B had failed答案选B,请问为什么,选A我可以说是失败很多次是个过去的事实呀 Paper was invented by a Chinese man called CAI LUN in AD 105 改为主动 Paper was invented by a Chinese man called CAI LUN in AD 105 改为主动 a chinese man called cai lun invented paper almost 2,000 years ago改为被动句 Cai Lun ___(发明)a new way to make paper many years ago. type 和 sort 的区别?Cai Lun created a new ____ of paper using pieces of old cloth.A way B sort C type D model Who ▁the paper in the world?Cai Lun▁.A invented；did B was invented；was C did invent；was As is recorded in history,paper was first invented by Cai Lun in_______is today Henan Province.A.where B.the place C.which D.what（请做必要说明,请不要答非所问， zen me cai neng ji ri yu dan chiji ri yu dan chi de shi hou zen me cai neng ji hao bu hui wang diao ta 一道完形填空.紧急!Paper was first invented by a Chinese man called Cai Lun in AD 105. He made is __1__ the wood of a kind of tree. Today,paper still __2__ from trees.We can use __7__ paper every day.We must begin using __4__ paper now becaus 求解决,语法选择Do you know when people began to use paper? The Chinese man 1 Cai Lun first invented it in ADl05．He made it 2 the wood of a kind of tree． Today,paper still 3 from trees．We use 4 paper every day．We must begin 看拼音写句子.Chi cheng huang lu qing lan zi,shui shi cai lian dang kong 看拼音写句子.Chi cheng huang lu qing lan zi,shui shi cai lian dang kong zen me yang cai neng z a you don 't know japanese ,and I don 't know japanese either 同义句转换还有cai Lun developed this kind of paper 改为被动语态 zhe ti wen mei you ren ping lun wei shen me yao ba ulti_mate de hui da cai na wei zhui jia da an? Is the famous Chinese exercise called Tai Chi Chuan healthy Yes ,of course I_ A.does you good B.makeIs the famous Chinese exercise called Tai Chi Chuan healthy Yes ,of course I_A.does you good B.makes you happy C.helps you strong D.goes well with you lun语的lun是哪个lun