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
此題考查that引導(dǎo)的主語從句的用法。句中的it是形式主語，真正的主語是eating vegetables in …life,所以要that引導(dǎo)這個主語從句，而that不作任何成分，也沒有意義，故答案是D項。
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