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
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
单项选择题
Which of the following is tree
A．There weren't any cows in Florida.
B．Mr. White had a joke with the guide.
C．Mr. White hadn't seen any cows before.
D．The cows in Florida were much bigger than those in Australia.
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