单项选择题

Charles Babbage is generally considered （） the first computer.

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

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单项选择题
Paul doesn't have to be made______. He always works hard.
A．learn
B．to learn
C．learned
D．learning
单项选择题
There was a terrible noise ______ the sudden burst of light.
A．followed
B．following
C．to be followed
D．being followed
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