l really don`t know where __.A it is boughtB he went我选的是a 为什么?

l really don`t know where __.A it is boughtB he went我选的是a 为什么?
l really don`t know where __.
A it is bought
B he went
我选的是a
为什么?

l really don`t know where __.A it is boughtB he went我选的是a 为什么?
因为有谓语了,后边接的是短语宾语

我个人认为是这样的
如果选A 的话应该是was