My original question, why he did it at all, has not been answered.
请教老师,在以上肯定句中,出现的at all如何理解含义?
why he did it at all 仍然是疑问句,很明显的疑问句,是 question 的同位语。
at all 用在疑问句中,其实没有什么具体的语义。只是加强疑问的语势而已,省掉也可。
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【答】在肯定句中,at all 表示“居然;简直”。如:It seems odd for him to be writing a novel at all. 他居然在写小说,真是奇闻。(摘自《英汉多功能词典》新编升级版p.45)