单项选择题

In ______ century, computers will be used more widely.

A．twenty-one
B．the twenty-one
C．twenty-fast
D．the twenty-first
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It is difficult to distinguish one twin ______ the other.
A．to
B．by
C．for
D．from
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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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