单项选择题

Clothing made of plastic fibers has certain advantages over ______ made of natural fibers like cotton, wool, or silk.

A．one
B．the one
C．that
D．what
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单项选择题
Mr. Johnson knew that the most trivial chore could prove to be a ______ if approached with enthusiasm.
A．prize
B．reward
C．refund
D．bonus
单项选择题
Among the first to come and live in North America ______, who later prospered mainly in New England.
A．were Dutch settlers
B．Dutch settlers had been there
C．Dutch settlers were there
D．had been Dutch settlers
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