单项选择题

I hadn’t seen him for years, but I ______ his voice on the telephone.

A．detected
B．realized
C．recognized
D．discovered
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单项选择题
______ it or not, his discovery has created a stir in scientific circles.
A．Believe
B．Believed
C．To believe
D．Believing
单项选择题
If we ______ timely changes to the plan, a great deal of time and money would have been lost.
A．shall not make
B．would not make
C．did not make
D．had not made
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