I know he hasn’t finished his homework, but , he has done his best.
A. at all
B. in all
C. after all
D. above all
网友回答
A. at all
B. in all
(答案→)C. after all
D. above all
解析：句意：我知道他没有完成作业，但是毕竟他已经尽了他的最大努力了。A. at all 根本； B. in all 总共； C. after all 毕竟； D. above all 首先，最重要的。根据句意故选C。