she couldn't help ()when she heard the newsshe couldn't help ()when she heard the news laugh to laugh laughing laughs 填哪一个?要给出理由

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she couldn't help ()when she heard the news
she couldn't help ()when she heard the news laugh to laugh laughing laughs 填哪一个?要给出理由

laughing
can't help doing sth 情不自禁做某事,此结构习惯上接动名词v-ing
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