2021银行校园招聘考试：英语单选题（11）
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
东吴教育参考答案解析
答案:A
解析：根据句意可知打铃及老师合上书本，这是下课的暗示，选项中只能选择signal。chance机会；mark分数，痕迹，measure方法，措施。
