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15、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

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

D

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