A-A+ In our class, when the bell rang and the teacher closed his book, it was a___________ 2020-02-27 15:30:07 其它问题 阅读 111 次 问题详情 In our class, when the bell rang and the teacher closed his book, it was a ___________ for everyone to stand up. A. signal B. chance C. mark D. measure 请帮忙给出正确答案和分析,谢谢! 参考答案