Why didn't you buy something for yourself?应选A
something 与anything 的区别和 some 与any的区别相同 在肯定句中通常用something 否定句和疑问句中通常用anything.但是,当期望得到对方的肯定回答时要用something,或是给建议时,也用something.比如 Would you like something to eat?
Why don't you ask someone to read them for you?
同样道理,“你为什么不……“ ”这里是给建议,说话者是不存在疑问,而是一种笃定的语气,这里应用someone,而不是anyone.
有用请采纳!