单项选择题

While ______ the gun, the satellite has sent more than four billion bits of information back to earth.A) having orbited B ) being orbitedC) having been orbited D) orbiting
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单项选择题
His office on the fortieth floor of a skyscraper in the center of New York City is the world______.
A．that he works
B．which he works
C．he works in
D．he works
单项选择题
The great use of a school education is not so much to teach you things ______ to teach you the art of learning.
A．than
B．rather than
C．nor
D．as
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