一道英语语法题,求高手解答Anyone,once ___ positive for H7N9 flu virus, will receive free medical treatment. A. tested B.being tested 答案是A,请问为什么不选B,不是有个once吗?这边的once有什么用?
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![一道英语语法题,求高手解答Anyone,once ___ positive for H7N9 flu virus, will receive free medical treatment. A. tested B.being tested 答案是A,请问为什么不选B,不是有个once吗?这边的once有什么用?](/uploads/image/z/3840316-52-6.jpg?t=%E4%B8%80%E9%81%93%E8%8B%B1%E8%AF%AD%E8%AF%AD%E6%B3%95%E9%A2%98%2C%E6%B1%82%E9%AB%98%E6%89%8B%E8%A7%A3%E7%AD%94Anyone%2Conce+___+positive+for+H7N9+flu+virus%2C+will+receive+free+medical+treatment.+A.+tested+++++++++++B.being+tested+%E7%AD%94%E6%A1%88%E6%98%AFA%2C%E8%AF%B7%E9%97%AE%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E9%80%89B%2C%E4%B8%8D%E6%98%AF%E6%9C%89%E4%B8%AAonce%E5%90%97%3F%E8%BF%99%E8%BE%B9%E7%9A%84once%E6%9C%89%E4%BB%80%E4%B9%88%E7%94%A8%3F)
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