it was so funny that we all couldn't _____laughingA.stopped B.make C.want D.help陈述理由,
问题描述：
it was so funny that we all couldn't _____laughing
A.stopped B.make C.want D.help
陈述理由,
答
D
can't help doing：忍不住。。
答
D could是情态动词
情态动词后面一定跟的是动词原形！
答
D
首先要用动词原形
can't help doing 表示情不自禁做某事
答
D