问题
单项选择题
After four years in America．he got（）
A．a degree of doctor
B．a doctor’s degree
C．the degree of a doctor
D．a doctor degree
答案
参考答案：B
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After four years in America．he got（）
A．a degree of doctor
B．a doctor’s degree
C．the degree of a doctor
D．a doctor degree
参考答案：B