we heard them

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选 Ahear sb doing.听见某人做某事
we heard them quarreling about money after the concert,and they looked very angry.
音乐会结束后,我听到他们在吵架,他们看起来非常气恼.
======以下答案可供参考======
供参考答案1:
A.quarreling
hear sb. doing sth
供参考答案2:
选a quarreling 表示正在进行
供参考答案3:
hear+宾语+宾补”这一结构中的宾补常可以由现在分词、不带to的不定式、过去分词等来充当，如：
Through the wall he could hear Harris cleaning his teeth.
She could hear the rain pattering against the windows.
Have you ever heard a pop song sung in Japanese?
I won’t hear anything said against him behind his back.
【试题链接】
After a knock at the door, the child heard his mother’s voice _____ him.
A．calling B．called C．being called D．to call
答案：A。供参考答案4:
hear sb doing sth. 表示某一个时刻听到某人在做某事，用quarreling，指的是他们“吵架”这个动作被你听到了