问题
选择题
----- 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
答案
答案：D
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。