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14.It has come to be realized ______ particular matters in the air expose us to life's real danger.(  )
A.whatB.whichC.whenD.that

分析 人们已经渐渐意识到,空气中的特殊物质是我们面临的生命的真正威胁.

解答 答案:D 题干中it是形式主语,真正的主语是后面的从句,即主语从句;从句结构完整,表达的是一个事实,要用that来引导.故选D.

点评 本题考查it作形式主语的用法,替代后面的真实的主语从句.主语从句属于名词性从句的一种.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.

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