His parents were teachers in that school, _______ lost their lives in order to save their students in the earthquake.
A.none of them
B.both of them
C.none of whom
D.both of whom
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D解析试题分析：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。