He faild in the exam ,____he had not prepared for it very well

题目

He faild in the exam ,____he had not prepared for it very well
A at all B above all C after all D all out

答案

选C.after all(毕竟)
根据意思理解,“他考试不及格,毕竟他准备不很充分.”,用after all符合题意.
而其它选项意思都不合理.
at all(根本)
above all(最重要的是)
all out(竭尽全力)