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（题文）（2016·江苏）To return to the problem of water pollution, I’d like you to look at a study _________i...
题目内容：
（题文）（2016·江苏）To return to the problem of water pollution, I’d like you to look at a study _________in Australia in 2012.
A. having conducted B. to be conducted
C. conducting D. conducted
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