—Hey, boy! We should keep the school clean. You throw litter about. —Sorry, I won’t do that again. A...
2022-10-20 13:34:59 98次 中考专题 动词的分类和时态练习题 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
—Hey, boy! We should keep the school clean. You throw litter about.
—Sorry, I won’t do that again.
A. mustn’t B. needn’t C. couldn’t D. may not
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