《英语考试题典》(本科生、研究生专用)(吉林科技出版社,p.131)有一道判错题: Charlie assured his wife that there was no danger, but she could not help but worry. A B C D
该书编者判 D(but worry) 为错误。但我认为 D(but worry) 并没有错。
可能编者把 cannot(couldn't) help but 和 cannot(couldn't) help 两个结构弄混了。cannot (couldn't) help but 之后应跟动词原形：
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When a friend gave Jim a ticket to the game, he couldn't help but go. (DAI) 当一位朋友给了吉姆一张比赛门票时，他是不能不去的。
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Langdon could not help but feel a deep sense of loss at the curator's death. (Dan Brown, The Da Vinci Code) 对于馆长的死，兰登禁不住有一种怅然若失的感受。（《达·芬奇密码》）
而在 cannot(couldn't) help 之后则应跟动名词。请对比这两种不同的用法：
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She couldn't help smiling. (Mansfield) 她禁不住笑了。
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“I don’t think Professor Jones meant to be funny this morning, do you?” “No, although I couldn’t help ____ at some of his remarks.” A. from laughing B. to have laughed C. but laugh D. to laugh(TOEFL)
请做下面的英语试题：
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(全国研考,91-11)