问题
单项选择题
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
答案
参考答案:D
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
参考答案:D