(that's a) good question!spokenNOT KNOW used to admit that you do not know the answer to a question 好一个难题!问得好!〔用以表示不知道某问题的答案〕 ‘How can we afford this?’ ‘Good question!’ “我们如何能负担得起这个呢?”“问得好!”
(that’s a) good question!• "Does the program allow you to do that?" "That's a good question - I don't know."
→ (that’s a) good question! at question1(7)