Although ______ American literature, he failed to remember the writer of the mas

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问题 Although ______ American literature, he failed to remember the writer of the masterpiece.

选项 A、be was knowing
B、he is knowing
C、knows
D、having a knowledge of

答案 D

解析非谓语动词题。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 中的 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 knowledge of中，所以选D 。

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