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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】

试题分析:考查主语从句和形式主语。此句中,it为句子的形式主语,而proved后面的从句才是该句的真正主语,即为主语从句。该主语从句中,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引导即可。if/because都不能用于引导主语从句,排除AB,when表示从句缺少时间状语也不对。句意:童年吃蔬菜有助于晚年健康的观点已经被证实。故选 D。

考点:考查主语从句和形式主语

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