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Anyone,oncepositiveH7N9virus,willreceivefreemedicaltreatment.A.testedB.beingtested选择哪个选项,说明原因

题目详情
Anyone,once___positive H7N9 virus, will receive free medical treatment. A. tested B.being tested选择哪个选项,说明原因
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答案和解析
选A。实际应是Anyone who was once_tested__positive H7N9 virus。。。省略关系代词和be动词