In recent years different ways ________ to recycle the plastic wastes. A. tried B. were tried C. hav...
2022-09-29 12:33:36 59次 上海市徐汇区2019届九年级上学期期末（一模）质量监控英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
In recent years different ways ________ to recycle the plastic wastes.
A. tried B. were tried C. have tried D. have been tried
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