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

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

C

解析試題分析:句意:這位警察現(xiàn)在還不能確信這個(gè)年輕男子是否是自殺。根據(jù)句意“是否”應(yīng)用if或whether,但因?yàn)榫浜笥衞r not,所以只能用whether,故選C。
考點(diǎn):考查賓語(yǔ)從句的連接詞

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