一Is your sister a worker or a doctor?— A. She is twenty．B. No，she isn’tC. She is a doctor

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A. She is twenty．
B. No，she isn’t
(答案→)C. She is a doctor
D. She likes her job
解析：本题是一个选择疑问句，要么回答她是一名工人，要么回答她是一名医生，故本题选C。