题目内容
_______ not easy _______ people ______ clean groundwater.
A. It's , for, in finding B. It, for , in finding
C. It , for , to find. D. It's , for, to find
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题目内容
_______ not easy _______ people ______ clean groundwater.
A. It's , for, in finding B. It, for , in finding
C. It , for , to find. D. It's , for, to find