Charles Babbage is generally considered to have invented the first computer.为什么要用to have不是has还有为什么要有to

As far as I know ,Charles Babbage is generally considered _____the first coputerA to inventB to have invented翻译 Charles Babbage is generally considered ______ the first computer.A. to invent B. inventing C. to have invented D. having invented As far as I know,Charles Babbage is generally considered___the first computer.A.to invent B.to have inventedC.having invented D.inventing 英语翻译40.Charles Babbage is generally considered______the first computer.A.to invent B.inventing C.to have invented D.having invented 1.Charles Babbage is generally considered ___ the first computer.a.to have invented b.inventing c.to invent d.having invented怎么分析这道题的? Charles Babbage is generally considered ____ the first computer.(MET93 34)A.to invent B.inventing C.to have invented D.having invented 为什么选C? Charles Babbage is generally considered to have invented the first computer.为什么要用to have不是has还有为什么要有to Charles Babbage is generally considered to have invented the first computer.这句话中的considered解释为什么?为什么用to have invented? we know that the first computer____by Charles Babbage.A.was invented B.is invented为什么选A.这不是一个客观事实嘛 Charles Babbage is generally considered _____the first computer .A.to have invented B.inventing C.to invent D.having invented 为什么选D,不能选ABC consider用法Charles Babbage is considered ______ the first computer.A.to inventB.inventingC.to have inventedD.having invented请问为什么选C? 1、19.Charles Babbage is generally considered ______ the first computers.A.to inventB.inventingC.to have inventedD.having invented请问这题为什么选C而不选A呢 Charles Babbage is generally considered __ the first computer.A.to invent B.inventing C.to have invented D.having invented请高手给个确切的答案,再讲下其中的语法知识, 一道语法选择题,关于非谓语动词.Charles Babbage is generally considered ( ) the first computer.a.to inventb.inventingc.to have inventedd.having invented我迷惑的是：为什么不可以是D 请问,Charles babbage is generally considered ____ the first computers.a.to invent b.inventing c.to have invented d.having invented请帮我分析一下为什么选c好吗 Charles Babbage is generally considered to have invented the first computer.的句子结构,to have invented是定语从句我知道,但结构真的判断不出来. 1)Be sure to write to us,______?A.will you B.aren't you C.can you D.mustn't you2)Charles Babbage is generally considered______the first computer.A.to have invented B.inventing C.to invent D.having invented3)Tony is going camping with ______boys.A.lit 2道英语选择题...原因.----Have you considered ___ your job?----No,I consider my job ____interesting .A to change,to be B to be changing,as C changing,being D changing,/ 21.Charles Babbage is generally considered ___ the first computer.A to inv