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
To be successful, a business needs to be aware of its ___________ and weakness as com- pared with its opponents.
A. virtue
B. merit
C. strength
D. advantage
单项选择题
You ______ her in her office last Friday; she's been out of town for two weeks.
A. needn't have seen
B. might have seen
C. must have seen
D. can't have seen
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