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

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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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