单项选择题

E-mail, as well as telephones, ______an important part in daily communication.

A．is playing
B．have played
C．are playing
D．play
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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
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
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