the little girl was heard _______(laugh) happily in the room a moment ago.

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thelittlegirlwasheard_______(laugh)happilyintheroomamomentago.thelittlegirlwasheard_______(laugh)hap

the little girl was heard _______(laugh) happily in the room a moment ago.
the little girl was heard _______(laugh) happily in the room a moment ago.

the little girl was heard _______(laugh) happily in the room a moment ago.
因为后面的a moment ago 意思是刚才.所以事情已经发生过去了.动作完成了,不再表示正在笑了,所以用原形laugh.原型表示动作的全过程,现在分词表示动作正在进行.

laughing

laughing

laughing
有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)

to laugh

to laugh

laughing
在hear后面的动词都是ing形式的
相当于heard that he/she was laughing 做分词,表进行时