问题
选择题
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
答案
答案：B
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。