问题
选择题
These books mustn’t ________ out of the reading room. You have to read them here.
A. take B. be taken C. be taking
答案
答案：B
题目分析：句意：这些书不能带出阅览室，你们必须在这里阅读。句子中主语books和谓语动词take是被动关系，故用被动式，其结构是系动词be+动词过去分词，故选B。