题目
He failed his exam, _____ proves that he wasn't working hard enough.A. whatB. of whichC. whichD. this
He failed his exam, _____ proves that he wasn't working hard enough.
A. what
B. of which
C. which
D. this
题目解答
答案
C. which
解析
本题考查非限制性定语从句的引导词。句子结构为“主句+逗号+引导词+从句”，逗号后的从句修饰整个主句“He failed his exam”，属于非限制性定语从句。
选项分析：
- A. what：不能引导定语从句，排除；
- B. of which：“of which”在定语从句中作定语，修饰名词，此处从句缺少主语，且无需“of”的所属关系，排除；
- C. which：可引导非限制性定语从句，指代整个主句内容，在从句中作主语，符合语法；
- D. this：是代词，不能引导从句，且用“this”连接两个句子会导致结构错误（缺少连词），排除。