Thebell________theendoftheperiodrangandwehadtostopourdi...

問題詳情：

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　[動詞形式題。indicate作the bell的定語且表示主動關係。]

知識點：非謂語動詞

題型：選擇題