第5题: [单项选择]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 参考答案:C 答案解析:[解析] can't(couldn't)help doing sth. 是一个常用的搭配,意为“忍不住做某事”。