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The policeman is still not sure    the young man killed himself or was killed .
A.ifB. thatC.whetherD./
答案:C
试题分析:if是否,如果;that因为,以至于;whether是否;weather天气。警察还不确定这个年轻人是自杀还是他杀。If和whether都能表示是否,但是whether常和or搭配使用,联系下文可知选C。
考点:考查连词辨析