when did they invent the personal comp

when did they invent the personal comp When did they invent the personal computer.用被动语态改写 When did they invent the plane?改为被动语态. When did he invent the telephone?变被动语态 When ______ the car ________?选项:a、did,invent b、was,invented 1.When did you invent the strange machine 2.Where do people When did they arrive ( ) the airport when did they visit the great wall? When did they have the meeting?"___" something they did not anticipate when they signed the contr 把When did they finish the homework?改为被动句 When did they（ start） the factory?同义句