Then over dinner,Franklin mentions that he well since he gave up smoking and Dr Candy,the local doctor,offers to write him a prescription for some medicine.
A. had not been sleeping
B. has not been sleeping
C. is not sleeping
D. was not sleeping
网友回答
A. had not been sleeping
(答案→)B. has not been sleeping
C. is not sleeping
D. was not sleeping
解析：根据语法since是“自从……以来”，前面一般用现在完成时，表示一直睡不好，应用现在完成时的进行时。