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    4．It has been proved_____eating vegetables in childhood helps to protect you against serious illnesses in later life．（　　）
    A．ifB．becauseC．whenD．that

    分析 据证实，儿童时期吃蔬菜能够帮助保护你在人生的后期抵抗疾病．

    解答 答案：D．
    考查it的用法．题干中it是形式主语，真正的主语是后面的主语从句，根据意思可知该从句不缺少任何成分，故选that，if是否，because表原因，when当从句中缺少时间状语时才可用．

    点评 本题考查it的用法．在主语从句中，当主语从句很长时，为了避免头重脚轻，故将主语从句放到句子的后面，主语就有it代替作形式主语．

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