问大家一道英语改错题(高中的)~

问题描述:

问大家一道英语改错题(高中的)~
Father:"You must always be careful never to drink too much."
Son:"How do you know how you've had enough?"
显然,这个how用错了.答案将它改成了when/that,那么,改成whether可以吗?我觉得也理解得通.

可以呀,理解的通,语法上也没毛病.
谁说的不可以?
i want to know whether you like it or not?经常见呀,不是宾语从句是什么?