Anyone, once _______ positive for H7N9 flu virus, will receive free medical treatment from our government.
A．to be testedB．being testedC．testedD．to test
C

試題分析：考查狀語從句的省略：句意：任何人，一旦被檢測出H7N9呈陽性，就可以得到政府免費(fèi)的醫(yī)療護(hù)理。英語中當(dāng)主從句的主語一致的時(shí)候，可以省略從句的主語和be動(dòng)詞，所以完整的從句應(yīng)該是once anyone is tested…..,這時(shí)可以省略anyone is，就剩下tested，所以選C。
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