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


解析:

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(gè)主語從句，而that不作任何成分，也沒有意義，故答案是D項(xiàng)。

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