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