单项选择题

In the past ten years skyscrapers have developed ______ in Chicago and New York City.

A．homogeneously
B．simultaneously
C．spontaneously
D．harmoniously
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单项选择题
No bread eaten by man is so sweet as ______ earned by his own labor.
A．one
B．what
C．such
D．that
单项选择题
The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.
A．had they been done
B．having been done
C．they had been done
D．they were done
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