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【题目】Cancer has become the top killer ________ I think threatens the health of millions of people.

A.thatB.of whichC.不填D.Both A and C

【答案】A

【解析】

考查定语从句。句意:我认为癌症已经成为威胁数百万人健康的头号杀手。分析句子可知,I think 为插入语,可暂且不管;这是一个定语从句,且先行词是top killer,从句中缺主语,故可用thatwhich。结合选项,故选A

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