In our class when the bell rang and the teacher closed his book it was a___________

学历类 公共英语 已帮助 人

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!

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