Maybe you have been to many countries ,but nowhere else __ such a beautiful palace.

题目

Maybe you have been to many countries ,but nowhere else __ such a beautiful palace.
A.can you find
B.you could find
C.you can find
D.could you find
答案是A.
为什么?不能选D?
请详细说明.

答案

选A
原因是 此句开头 用nowhere 此否定副次后跟从句 需要倒装
所以是can you find
could是can的过去式 但是这句话并没在过去时态上
所以不能用could