Speaker A: Are you feeling better now?

Speaker B :__________.

A. Well, not too better yet, thank you

B. Well, not too good yet. Better than I was thought

C. Well, it doesn't matter. I am all right now

D. Well, never mind, I'm much better now

B【解析】A中的not too better yet不符合英文的表达习惯；C、D答非所问。B表示“虽不太好，但比以前好多了”，是更佳选择。