---Have you ever heard of an American president called Chester A. Arthur.---No, and he’s not been mentioned in my history book at all. He seems __________.A.to have been pletely forgottenB.having pletely forgottenC.to have pletely forgottenD.pletely forgetting
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A解析本题考查非谓语动词的用法。句意为：--你听说过一个名叫Chester A. Arthur的美国总统吗？--没有，我的历史书里根本没有提及过他。他似乎已被彻底地遗忘。seem后不能接v. -ing。根据原句的意思，动词forget要用被动语态的完成时形式。