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问题: The middle-aged man dennied having been there.为何要用having been?

解答:

有些动词后跟非谓语动词时,非谓语动词只用动名词(doing/being done).如:avoid,finish,allow,permit等.而有些既可用doing,也可用having done,二者没有区别.如: regret,remember,forget,deny等.如:I regret telling/having told him the secret.