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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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
单项选择题
She has made it clear()she will not take part in parties of any kind recently.

A．if
B．that
C．although
D．while
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