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

A．to be taken
B．had been taken
C．being taken
D．to be taking
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