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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