If this dictionary is not yours , ____ can it be ? 选择题?

问题描述:

If this dictionary is not yours , ____ can it be ? 选择题?
If this dictionary is not yours , ____ can it be ?
A:what elseB:who elseC:which else's D:who else's
答案是D为什么? 怎么翻译?

如果这本字典不是你的,那么它还会是谁的呢?