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
(), we decided to go swimming in the sea.

A. It being a fine day
B. The day was fine
C. It was a fine day
D. Being a fine day
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
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