题目内容

Last month 3 people got injured in a gas explosion,        has not been discovered yet.

A.whose cause B.the cause of that C.which cause D.the cause

A

解析试题分析:上个月3个人在煤气爆炸中受伤,爆炸的起因还没有发现。先行词是a gas explosion,定语从句中cause缺少定语,用whose引导定语从句,或the cause of which,选A。
考点:考查定语从句

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