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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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
单项选择题
He is ______ a horse.
A．stronger as
B．as stronger than
C．the strong as
D．stronger than
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