Toreturntotheproblemofwaterpollution,I'dlikeyoutolooka...

問題詳情：

 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