----- The boys are not doing a good job at all, are they? ---- .
A. I guess not so
B. I don’t guess
C. I don’t guess so
D. I guess not
网友回答
A. I guess not so
B. I don’t guess
C. I don’t guess so
(答案→)D. I guess not
解析：I guess not. 我认为他们没做好工作。为了避免重复，用not替代are not doing a good job at all。