单项选择题

Clothing made of man-made fibers has certain advantages over （） made of natural fibers like cotton, wool or silk.

A. One
B. that
C. which
D. what

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单项选择题

（） is often the case; we have worked out the production plan.

A. As
B. Which
C. What
D. While

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Cares play an important role in modern life, but they () also cause many problems like air pollution.

A. can
B. should
C. would
D. need

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