Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that ha

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问题 Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that have always had a completely female medical staff.

选项

答案have—has

解析 译文:伊丽莎白-布莱克韦尔是美国历史上第一位女医学博士。她创建了纽约医务室——一所医务人员一直为女性的医疗机构。
分析:考查主谓语一致。that引导的定语从句修饰先行词an institution,从句主语that指代单数意义的institution,故其谓语也应用动词的单数形式,have应改为has。
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