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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单项选择题

Only once in his life had Douglas permitted himself（）control of his emotions.

A. to lose
B. lost
C. lose
D. losing

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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