选B 这是一个非谓语动词的用法,stopping是动词的分词形式表示一个伴随状语,与逻辑主语构成一个主动关系,这题容易错宣城A,因为有个only to do 动词不定式表述一种意外的结果,这里不是
句子的意思是：学生正在忙着做作业,只是偶尔停一下休息一下
The students were busy doing their homework,only____ once in
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