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Ihadjustfinishedmyexampaperwhenthebellrang,announcingtheclasswasover.announcing表我不是被宣布吗?这里怎么可以用announcing?

题目详情
I had just finished my exam paper when the bell rang,announcing the class was over.announcing表
我不是被宣布吗?这里怎么可以用announcing?
▼优质解答
答案和解析
这里announcing的主语是bell rang.
因此这句话还可以写成I had just finished my exam paper when the bell rang which announcing the class was over.
不知道对不对,