单项选择题

When he was in his ______ , he began to study English.

A．forty
B．forty's
C．forties
D．forty's years old
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The bread and butter ______ served for breakfast.
A．are
B．is
C．have
D．had been
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In ______ century, computers will be used more widely.
A．twenty-one
B．the twenty-one
C．twenty-first
D．the twenty-first
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