The policeman is still not sure ______ the young man killed himself or not. A. if B. that C. whether...
2023-01-11 15:32:15 94次 2014-2015学年江苏宝应氾水镇初级中学九年级12月阶段调研英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The policeman is still not sure ______ the young man killed himself or not.
A. if B. that C. whether D. weather
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