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【题目】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:已经证明童年时期吃蔬菜有助于你在以后的生活中防御严重的疾病。此题中it为本句的形式主语,that引导主语从句,作真正的主语,故填that。

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