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It has been proved______eating vegetabl...

 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

 

 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。 答案:D.
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