though he worked hard,( )he failed to pass the exam yet however as a result but 为什么选yet要详细解

题目

though he worked hard,( )he failed to pass the exam yet however as a result but 为什么选yet要详细解

答案

全句的意思是：尽管他很努力学习,但是他没有通过考试.
应该表示转折关系,所以排除as a result
而 however 后面一般加逗号与从句隔开,也排除.
只剩下 yet ,but.
而 yet可以表示已经得到的结果.因而选 yet