The lab can be dangerous, so we________ always wait for the teacher to arrive before we start work. ...
2022-06-07 03:46:18 104次 2020年天津市毕业生学业考试模拟（一模）英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
The lab can be dangerous, so we________ always wait for the teacher to arrive before we start work.
A.may B.can’t C.must D.needn’t
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