Stephan Zweig (1881-1943) was a prolific writer whose vivid portrayals of his characters, whether fictional or factual, were emphatically probing and believable.
请问这里的whether fictional or factual是作插入语吗?还是状语从句?
《高考英语备考1号·速效编》
《高考英语备考1号·写作编》
《高中英语晨读晚记》
《高中英语错题笔记》
《零起点考大学英语》