【題目】It has been proved eating vegetables in childhood helps to protect you against serious illness in later life.

【答案】that
【解析】句意：已經(jīng)證明童年時(shí)期吃蔬菜有助于你在以后的生活中防御嚴(yán)重的疾病。此題中it為本句的形式主語(yǔ)，that引導(dǎo)主語(yǔ)從句，作真正的主語(yǔ)，故填that。

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