It isn't so much whether he works hard; the question is whether he works .A. above allB. i

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A. above all
B. in all
(答案→)C. at all
D. after all
解析：at all全然，真地（常用于肯定句中）：If you do it at all, do it well.(你若真做，就得做好。)not...at all全不，毫不：He doesn't seem at all interested in my plane.(他似乎对我的计划毫无兴趣。)above all(=most important of all)最重要的。in all总计：We were fifteen in all.(我们总计15人。)after all毕竟，终究。
本题译文：他是否努力工作到并不重要，问题是他是否真正地做了。