When he heard the joke,he couldn't help___(laugh)(请写出原因,

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Whenheheardthejoke,hecouldn''thelp___(laugh)(请写出原因,Whenheheardthejoke,hecouldn''thelp___(laugh)(请写出原因,

When he heard the joke,he couldn't help___(laugh)(请写出原因,
When he heard the joke,he couldn't help___(laugh)
(请写出原因,

When he heard the joke,he couldn't help___(laugh)(请写出原因,
答案是;laughing
couldn't help donging是一个固定词组,意思是情不自禁做某事
比如:couldn't help crying的意思是情不自禁的哭了

laughing
couldn't help后面是要接动词的ing形式的.
翻译:他一听到那个笑话,就禁不住笑了出来.

用laughing
can not doing;是禁不住做媒事。
如用to do 是不能帮忙做媒事

laughing
couldn't help后面接动词+ing形式.
他一听到那个笑话,就不住的笑了出来.
望采纳