问题
选择题
---What made the students so upset?
---______ to go to the movie.
A．Having not been allowed
B．Not having allowed
C．Because of not having allowed
D．Not having been allowed
答案
答案：D
考查非谓语动词。句意：什么让这些学生们如此沮丧？——没有被允许去看电影。动名词做主语表示抽象动作，其否定式一般是在动名词前加not，本句中学生们是被允许的对象，用被动语态，故选D。