单项选择题

I hadn't seen him for years, but I ______ his voice over the telephone.

A．realized
B．discovered
C．accepted
D．recognized
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The time will come ______ man can fly to outer space at his leisure.
A．that
B．when
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We can hardly avoid making any mistakes in our work ______ hard we try.
A．whatever
B．how
C．no matter
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