题目

_____ writer, she is excellent, _____ teacher she is not very good. 　 A. As; but as 　 B. As; and as　 C. As a ; but as a 　 D. As a; and as a 答案：C 解析: 作为一个作家，她是优秀的；但作为一名教师，她就不是很好的了。 writer 和teacher都是可数名词，单数要加冠词a。

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