The bell _________ the end of the period rang， _________ our heated discussion．

A.indicating；interrupting

B.indicated；interrupting

C.indicating；interrupted

D.indicated；interrupted

答案及解析： A

the bell在句中作indicate和interrupt的逻辑主语，所以要用现在分词.第一空填indicating，现在分词短语作后置定语修饰the bell；第二空填interrupting，现在分词短语作伴随状语.这句意思是“铃声宣布下课，打断了我们热烈的讨论.”答案为A.