问题补充：
I did learn how to cook until I came here.对until I came here提问.答案是when didn‘t you learn how to cook?感觉不对,为什么?
答案：
应该是When did you learn how to cook?
======以下答案可供参考======
供参考答案1:
就是不对。。。怎么会是didn‘t，应该是When did you learn how to cook?
供参考答案2:
应是When did you learn how to cook?
