whose else can it be 是正确的句子吗

There's an English cloze test I can't deal with.> --This dictionary is not David's,his in my desk.> --If it's not his,__can it be ?> A.who else's B.whose else's C.whose else D.who's else> Which is the best answer?> The key in my book is A.Why can't we choose C?哪位英语大虾说一下啊
为什么只能说who else's can it be?而不能说whose else can it be?

whose else can it be 是正确的句子吗 If You Can Do Anything Else she can speak english better than anyone else If it isn't yours, whose it can be? 对呢？还是If it isn't yours, whose can it be?对？ Everybody Else Is Doing It, So Why Can't We? No one else can make me feel the colour that you bring 这话怎么翻译呀? 寻找一首歌中的歌词有no one else can love you like I do.. _______ that they refuse us, who else can we turn to for help? No one else can make me feel the colour that you bringp这是哪首歌的歌词 What else can a father wish for than to have a lovely daughter who is happy