第20题: [单项选择]Which of the following sentences expresses "ability" A. He can’t have slept through all that noise. B. If you won’t keep quiet you can get out. C. You can’t take the book out of the room. D. The classroom can seat thirty students. 参考答案:D 答案解析:A项中can用来表示推测(那么吵,他不可能睡得着觉。);B项中的eani表示命令(你如不保持安静,就请你走。);C项中的can表示允许(你不可以将这本书拿出室外。);D项中的can表示能力(这教室能坐