() 4. -Is your sister a nurse?一Well,she . But she is a doctor now. A. used to B. was used to C. used to be D. is used to be 题目和参考答案——青夏教育精英家教网—

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() 4. —Is your sister a nurse?

一Well,she . But she is a doctor now.

A. used to B. was used to

C. used to be D. is used to be

4.C

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