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問題詳情:

 Toreturntotheproblemofwaterpollution,I'dlikeyoutolooka...

 To return to the problem of water pollution, I'd like you to look at a study _______ in Australia in ㊣2012

  A. being conducted        B. conducting   C. conducted    D. having conducted  

【回答】

C

知識點:非謂語動詞

題型:選擇題

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