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】

試題分析：考查主語從句和形式主語。此句中，it為句子的形式主語，而proved后面的從句才是該句的真正主語，即為主語從句。該主語從句中，eating vegetables in childhood helps to protect you against serious illness in later life 并不缺少任何成分，所以只需用that引導(dǎo)即可。if/because都不能用于引導(dǎo)主語從句，排除AB，when表示從句缺少時(shí)間狀語也不對(duì)。句意：童年吃蔬菜有助于晚年健康的觀點(diǎn)已經(jīng)被證實(shí)。故選 D。

考點(diǎn)：考查主語從句和形式主語

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