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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I remember（）to the zoo by my father when I was a child.

A. to be taken
B. had been taken
C. being taken
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Language is a city, to the building of（）every human being has brought a stone.

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