There is still a long way to go to solve all the problems _________conservation of natural resources...
2022-10-03 14:25:31 72次 江苏省高中英语必修五牛津译林版练习题：Unit 2 The environment 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
There is still a long way to go to solve all the problems _________conservation of natural resources.
A. concerning B. concerned
C. concerning about D. concerned about
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