影音先锋制服丝袜_欧美 国产 日本_亚洲欧美综合自拍_亚洲最大成人在线观看_成人一区二区三_色呦呦网站入口_亚洲欧美高清在线_黄页网站在线看_一卡二卡在线观看_在线观看免费黄网站

Charles Babbage is generally considered to _______ the first computer.

．Charles Babbage is generally considered ______ is the first computer．

A．to invent           B . inventing   C . to have invented      D . having invented

Charles Babbage is generally considered ________ the first computer.

A. to invent     B. inventing     C. to have invented     D. having invented

Charles Babbage is generally considered______-the first computer.

          A. to invent   B .inventing   C. to have invented   D. having invented

Charles Babbage is generally considered ___ the first computer.

    A. having invented    B.  inventing    C. to have invented    D. to invent

Charles Babbage is generally considered ________ the first computer.

A. to invent 　　　　 B. inventing

C. to have invented　　 D. having invented

Charles Babbage is generally considered ______ the first computer.

A. to invent 　 　　　 B. inventing

C. to have invented 　 D. having invented

Charles Babbage is generally considered ________ the first computer.

A. to invent 　　　　 B. inventing

C. to have invented　　 D. having invented