It is known to us that eating vegetables and fruit____________one’ s immunity.

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问题 It is known to us that eating vegetables and fruit____________one’ s immunity.

选项 A、has improved
B、improve
C、improves
D、to improve

答案C

解析 分析句子结构可知,I是形式主语,真正的主语是that引导的主语从句,从句中缺少谓语动词,因此可排除D项。根据句意和常识可知,“吃蔬菜和水果可以提高一个人的免疫力”是一个客观事实,所以从句应用一般现在时。又因为从句的主语eating vegetables and fruit是动名词短语,所以其后的谓语动词应用单数形式。故选C。
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