熱心網友

有些動詞后跟非謂語動詞時,非謂語動詞只用動名詞(doing/being done).如:avoid,finish,allow,permit等.而有些既可用doing,也可用having done,二者沒有區別.如: regret,remember,forget,deny等.如:I regret telling/having told him the secret.

熱心網友

完整的句子是：The middle-aged man dennied (that he was) having been there. 括號內的內容可以省略。