Have you seen Jack and John?--I haven't seen__________ of them.

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
【题目解析】：表示二者的“都”或“任何一位”用neither或either。排除B项和D项。谓语动词已经否定，c项是正确的。句意为:“一你看见杰克和约翰了吗?一他们两个我都没看见。”