The bell the end of the period rang, our heated discussion.A. indicating; interruptingB. i

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(答案→)A. indicating; interrupting
B. indicated; interrupting
C. indicating; interrupted
D. indicated; interrupted
解析：第一空考查indicating做后置定语修饰The bell，第二空考查并列谓语，rang和interrupted是并列关系，句意是：表示结束的铃声突然响了，打断了我们的激烈讨论。选A。