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
It was amazing（）she managed to stay calm in such a situation.

A. her way
B. by way
C. the ways
D. the way
单项选择题
Businessmen make most of their income from profit（）by producing and selling products.

A. earning
B. is earned
C. earn
D. earned
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