Anyone , once _______ positive for H7N9 flu virus , will receive medical treatment from our governmentA.to be testedB.being testedC.testedD.to test
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C解析试题分析：句意为：一旦被检测出感染了H7N9流感病毒，任何人都要从我们的政府那里接受医学治疗。从once条件状从的角度，此题可以考虑为是在考查省略，省略的条件为非谓语动词的逻辑主话与句子的主语（everyone）一致，且有系动词be,这时可省去主语和be动词，补充完整为:Anyone, once (anyone is ) testedPositive for H7N9 flu virus, will receive medical treatment from our government. 故