Question

His parents were teachers in that school, _______ lost their lives in order to save
their students in the earthquake.  

1. A.
   none of them
2. B.
   both of them
3. C.
   none of whom
4. D.
   both of whom

Answer 1

D
试题分析：经过分析，可知这个句子中包含一个非限制性定语从句。Them不能引导定语从句，又因为His parents是两个人，表示两者故用both。
考点：定语从句考查
点评：分析清楚句子结构是关键，根据关系词在从句中所作的成分以及含义，选择正确的关系词。