Thebell________theendoftheperiodrangandwehadtostopourdi...

问题详情：

The bell ________the end of the period rang and we had to stop our discussion.

A．indicating  B．indicated

C．to be indicated  D．being indicated

【回答】

A　[动词形式题。indicate作the bell的定语且表示主动关系。]

知识点：非谓语动词

题型：选择题