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The policeman is still not sure ______ the young man killed himself or was killed.
A.ifB.thatC.whetherD.weather
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。
点评:连词在句子中主要起联系上下文的作用,他们之间的区别就是表示逻辑关系的不同,所以在解题时先要理解上下文含义,然后根据上下文逻辑关系选择合适的连词。连词的用法都比较多,语义之间还有交叉,熟记其基本应用规则,了解其区别,注意固定搭配对象,是做好此类题型的关键。
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