Students be careful when they do physical experiments in the lab. A.can B.must C.need D.ought to
2022-09-03 17:01:17 171次 上海市2019-2020学年八年级上学期第一次月考英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Students be careful when they do physical experiments in the lab.
A.can B.must C.need D.ought to
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