问题描述：
My mother used to be ( ) taacher of Chinese before she turned ( ) writer.
My mother used to be ( ) taacher of Chinese before she turned ( ) writer.
A.the,a
B.a,/
C.a,a
D./,/
为什么选B,说下理由吧~
My mother used to be ( ) taacher of Chinese before she turned ( ) writer.
A.the,a
B.a,/
C.a,a
D./,/
为什么选B,说下理由吧~
问题解答：
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