This argument sounds reasonable, but it’s incorrect. A. fortunatelyB. actually C. natural

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A. fortunately
(答案→)B. actually
C. naturally
D. obviously
解析：考查副词辨析。句意：这种论调貌似有理， 实际上是错误的。fortunately 幸运地；actually 实际上；naturally 自然地；obviously 显而易见地。根据前后两个句子的逻辑关系可知此处使用actually。