He worked hard he got high marks in this exam

答案：B
考点：状语从句中 连接词的辨析
翻译：他努力学习,因此他在这次考试中得了高分.
So that引导结果状语从句 所表示的结果往往同主句有因果关系
So that 直接连接两个单句
如：He didn’t plan his time well,so that he didn’t finish his work in time.
他没有把时间计划好,结果没有按时完成这项工作.
而 as a result 单独使用,后面一般用逗号隔开,并且不能连结2个句子.
He worked hard at his study.As a result,he passed the exam easily