单项选择题

Peter is one of the few persons I know who ______ learnt from experience.

A．has
B．was
C．had
D．have
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单项选择题
It is ______ of him to leave the classroom just because the others didn't agree with him.
A．childish
B．childlike
C．pretty
D．natural
单项选择题
Those are old rules. They don't ______ any more.
A．apply to
B．apply for
C．apply
D．be use//
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