anyone should want to kill her was unbelievable.A. WhetherB. ThatC. WhatD. If

问题补充：

anyone should want to kill her was unbelievable.

A. Whether

B. That

C. What

D. If

答案：

A. Whether

(答案→)B. That

C. What

D. If

解析：考查主语从句，分析句子结构was谓语动词，前面的都是主语，这是个主语从句，主语从句是完整的不缺成分，用that连接主语从句，不能省略。选B。