单项选择题

John was a student, but at the same time he was_______.

A．a butcher and doctor
B．a manager and doctor
C．an assistant
D．a manager
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单项选择题
John made enough money by_______.
A．studying in the university
B．working in a butcher's shop
C．doing two jobs
D．cutting meat well
单项选择题
The woman patient recognized John because_______.
A．he was wearing white clothes
B．he sold meal to her
C．he was now working in the hospital
D．he was going to operate on her
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