some students ran back to the dormitory,magazines__under their arms.A,was held B,held C,holding

考查独立主格结构,由于主句句子成分齐全,不能选A,（两个句子缺少连接词）
书是被夹在胳膊下的,排除C
夲句等于：Some students ran back to the dormitory and the magazines were held under their arms.您所说的”考查独立主格结构，由于主句句子成分齐全，不能选A,（两个句子缺少连接词）“我不太明白为什么不能选A而可以选B？可以解释下吗英语中两个句子放在一起需连接词，或中间用句号，作为两个句子。夲句中前句是完整句子，后面是逗号，故后面不宜是句子，（原因就是没连接词）。其实夲句可看成是：Some students ran back to the dormitory (with) the magazines held under their arms.我的意思是想问一下为什么用A后面句子就完整，用B就不完整呢？magazines were held under their arms.主谓齐全，是不是一个完整的句子？？magazines held under their arms .如看成完整句子就是病句，因需被动。held是hold的过去式也表示被动啊，这么就是病句了呢？held是过去分词，所以夲句考查的是独立主格结构。你学过非谓语动词吗？非谓语动词可以作状语你知道吗？