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

A．that
B．which
C．where
D．what
单项选择题
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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