单项选择题

Internet, a ______ of millions of computers linked world wide, is the largest system serving e-mail messengers.

A. unity
B. connection
C. network
D. combination
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单项选择题
To drive a car safely, it is ______ good brakes.
A. essential with
B. essential having
C. essential to have
D. essential have
单项选择题
What authors do you like Shakespeare is ______.
A. favorite for me
B. my favorite
C. for me the favorite
D. the favorite of mine
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