Most environmental problems exist because adequate measures for preventing them ____in the past. A. ...
2022-10-31 11:17:05 66次 2014-2015学年福建华安县第一中学高三高考围题卷英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Most environmental problems exist because adequate measures for preventing them ____in the past.
A. not being taken B. didn’t take
C. were not taken D. haven’t taken
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