–HaveyouseenJackandJohn?–Ihaven’tseen______oft

— Have you seen Jack and John?

— I haven’t seen ______ of them.

A. neither

B. any

C. either

D. all

正确答案：C
表示二者的“都”或“任何一位”用either或neither排除选项B和D谓语动词已经给以否定选项C是正确的