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4.Chinese medical experts have warned _____ antibiotics(抗生素) have been"heavily overused"at hospitals,which might cause serious side-effects.(  )
A.whatB.whetherC.thatD.why

分析 中国的医疗专家已经做出了警告,医院过度使用抗生素会引起严重的副作用.

解答 答案:C 题干中antibiotics have been"heavily overused"at hospitals是作warn的宾语,是一个宾语从句;从句结构完整,表达的是一般事实,要用从属连词that来连接.故选C.

点评 在句子中起名词作用的各种从句统称为名词性从句.根据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句. 本题中that只起连接作用,不充当成分,没有词意.

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