Wow There are so many books .I really can't decide ( )

问题描述:

Wow There are so many books .I really can't decide ( )
A、where to buy
B、which to buy
C、what to buy
D、how to buy
为什么不选C,求详解...

前面已经提到有这么多的书,所以肯定是买书,所以不说买什么,而应该说买哪一本可是选C也合理吧?。。。不合理,理由就是上面所说的