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

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问题 When Jane fell off the bike, the other children ______.

选项 A、were not able to help laughter
B、could not help but laughing
C、could not help laughing
D、could not help to laugh

答案C

解析 情态动词。can’t/couldn’t help doing sth.意为“忍不住做某事”。
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