单项选择题

Though I haven't seen him for years, I can ______ his voice on the telephone.

A．realize
B．discover
C．accept
D．recognize
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单项选择题
In no way ______ from practice.
A．theory can be separated
B．theory is separated
C．can theory be separated
D．has theory been separated
单项选择题
It is difficult to distinguish one twin ______ the other.
A．to
B．by
C．for
D．from
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