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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1321

The policeman is still not sure ______ the young man killed himself or was killed.

A.if B.that C.whether D.weather
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Thepolicemanisstillnotsurethey