B.them;fixed为什么选B.可以详细解答一下吗楼主请看：以下句子均为正确表达--------请留意带“【】”的部分。1，There are a lot of students in the reading room【,】most of【 them 】with their eyes fixed on and their heads bent over their books.（most of them with their eyes fixed on and their heads bent over their books为独立主格结构）2，There are a lot of students in the reading room【,】most of【 whom 】fixed their eyes on andbent their heads over their books.3，There are a lot of students in the reading room【.】【M】ost of them fixed their eyes on and bent their heads over their books看过上面三个句子，还有疑问，请追问。。。。