题目内容
【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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题目内容
【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。