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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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
单项选择题
Hardly ______ when the lights went out.
A．the performance had begun
B．had the performance begun
C．the performance began
D．did the performance begin
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