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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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

选A.实际应是Anyone who was
once_tested__positive H7N9 virus.省略关系代词和be动词