单项选择题

Never（）seen so many people cooperating in such an event.

A. is the world
B. has the world
C. the world is
D. the world has

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This is the only part of the country（）this type of pottery can be found.

A. that
B. which
C. where
D. what
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Professor Liu（）for 20 years by the end of next summer.

A. has taught
B. will be teaching
C. has been teaching
D. will have taught
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