单项选择题

The bread and butter ______ served for breakfast.

A．are
B．is
C．have
D．had been
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单项选择题
In ______ century, computers will be used more widely.
A．twenty-one
B．the twenty-one
C．twenty-first
D．the twenty-first
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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