语法与词汇

He failed in his exam, ________proves that he hadn't worked hard enough.

【正确答案】 C
【答案解析】

分析:考查非限制性定语从句的用法,which 在该题中所指代的是整个主句“he failed in his exam”,在从句中作主语。故本题答案为 C。
句意:他考试不及格,证明他学习不够刻苦。