[单项选择]Although ______ American literature, he failed to remember the writer of the masterpiece. A. he was knowing B. he is knowing C. knows D. having a knowledge of
参考答案:D 答案解析:习惯用法题。know是静态动词,不能用于进行时;选项[C]knows从句中又缺少主语。选项[D]knowledge作“知识”讲时是不可数名词,但作“了解”讲时,前面可加“a”,常用于词组have a