问题
选择题
Charles Babbage is generally considered ______ the first computer.
A．to invent
B．inventing
C．to have invented
D．having invented
答案
答案：C
不定式的动作发生在谓语动词之前，不定式要用完成时态。
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Charles Babbage is generally considered ______ the first computer.
A．to invent
B．inventing
C．to have invented
D．having invented
答案：C
不定式的动作发生在谓语动词之前，不定式要用完成时态。