问题
选择题
Charles Babbage is generally considered to _______ the first computer.
A．to invent
B．inventing
C．to have invented
D．having invented
答案
答案：C
考察不定式用法。Consider sb to do/be…认为某人…；发明了第一台电脑是一个已经完成的事情，所以使用完成式to have done.