Various efforts ________ in the past decades to protect the environment. A. had made B. have made C....
2022-05-31 21:40:05 56次 天津市河西区2019-2020学年高三上学期期中英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Various efforts ________ in the past decades to protect the environment.
A. had made B. have made
C. were made D. have been made
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