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When Jane fell off the bike,the other children ___.

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When Jane fell off the bike,the other children ___.
A.were not able to help laughter
B.could not help but laughing
C.could not help laughing
D.could not help to laugh
When Jane fell off the bike,the other children ___.
C. could not help laughing.
第一句不对因为help 和laugh 都是动作动词(action verb)
第二句不对因为but是个clause,需要一个动词(laugh),而laughing是一个participle. Participles是通常当gerunds或者modifiers用.
第四句不对,因为它的意思变成”不能帮助他笑”