问下第15题选having seen 为什么不行,having seen不可以是动名词吗?

问下第15题选having seen 为什么不行,having seen不可以是动名词吗? having seen是什么用法 I remember having seen him somewhere I Remember having seen him somewhere . I remember having seen her in a cafe中的having seen是不是非谓语动词? 为什么说She denied having seen these necklaces 而不说She denied has I remember having seen him somewhere 这里have 为什么用ing John's having seen her did not make hr worried. Never having seen anything like this style of architecture b john`s having seen her did not make her worried 中seen也是非谓语动词 having seen,seen,see ,seeing a doctor.有什么区别,分别什么含义 (2/2)ing C having seen D to have seen 这个题为什么选择B.求详解.