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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单项选择题

She apologized（）the mess she had made, but her parents were still very angry.

A. at
B. on
C. with
D. for

单项选择题

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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