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

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

C

解析试题分析:句意:这位警察现在还不能确信这个年轻男子是否是自杀。根据句意“是否”应用if或whether,但因为句后有or not,所以只能用whether,故选C。
考点:考查宾语从句的连接词

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