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

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单项选择题
He was frightened by（）lightning.

A．bolt of
B．a piece of
C．a flash of
D．a
单项选择题
Fifteen years have passed since we graduated from the middle school.I have found she has（）.

A．some white hair
B．much white hair
C．a few white hairs
D．a little white hair
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