The ball __the end of period rang__the heated discussion.A.indicating,interruptingB.indicating,interruptedball------改为bell
问题描述：
The ball __the end of period rang__the heated discussion.
A.indicating,interrupting
B.indicating,interrupted
ball------改为bell
答
b
答
A
已经有谓语动词rang了
用非谓语动词doing形式表主动
一句话不能有两个谓语
所以不能用过去式
因为是bell interrupt是主动,不能用过去分词