单项选择题

Charles Babbage is generally considered ______the first computer.

A．to have invented
B．inventing
C．to invent
D．having invented
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单项选择题
—Mum, why do you always make me eat an egg every day —______enough protein and nutrition as you are growing up.
A．Get
B．Getting
C．To get
D．To be getting
单项选择题
Mr. Reed made up his mind to devote all he had to______ some schools for poor children.
A．set up
B．setting up
C．have set up
D．having set up
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