单项选择题

A．Practical experience and ability.
B．Years of patient practice.
C．A piece of paper.
D．A set of instructions.
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单项选择题
A．He was about 24 years old.B．He was a talented mechanical engineer.C．He was always ready to accept advice and criticism from other people.D．He was strong-minded.
A．He was about 24 years old.
B．He was a talented mechanical engineer.
C．He was always ready to accept advice and criticism from other people.
D．He was strong-minded.
单项选择题
A．He was ill.B．He was in holiday.C．He was dismissed.D．He changed a job.
A．He was ill.
B．He was in holiday.
C．He was dismissed.
D．He changed a job.
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