问题
选择题
The couple ______at this time yesterday. Nobody knew when they stopped.
A．heard quarrelling
B．heard to quarrel
C．were heard quarrelling
D．was heard to quarrel
答案
答案：C
考查时态及语态.句意:昨天这个时候听到这对夫妇吵架了.没有人直到他们什么时候停止的.结合语境可知前文描述的是过去某时的动作,句子主语是动作对象,故用被动语态.现在分词作状语表示正在进行的伴随性动作,这对夫妇是复数形式,故助动词用复数,结合语境可知选C.
