without electronic computers,much of today's advanced technology_______.a.would not be achievedb.would not have been achieved请问a和b有什么区别

electronic electronic electronic electronic address electronic notification without electronic computers,much of today's advanced technology_______.a.would not be achievedb.would not have been achieved请问a和b有什么区别 without electronic computers ,much of today 's advanced technology(工艺）_______.为什么选择would not have been achieve .have/had not been achieved 错在哪了? 英语翻译Electronic Commerce,commonly known as (electronic marketing) e-commerce or eCommerce,consists of the buying and selling of products or services over electronic systems such as the Internet and other computer networks.The amount of trade c without Without Without without without without without A.electric B.electronic C.electrical D.electricity这四个词的区别是什么啊 So when you open your electronic mail,check the information c irrevocable L/C without our confirmation