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    精英家教网 > 高中英语 > 题目详情
    It has been proved______eating vegetables in childhood helps to protect you against serious illnesses in later life.
    A．if B．because C．when D．that
    D
    此题考查that引导的主语从句的用法。句中的it是形式主语，真正的主语是eating vegetables in …life,所以要that引导这个主语从句，而that不作任何成分，也没有意义，故答案是D项。
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