John promised his doctor he would not smoke,and he__since then A had never smoked
问题描述：
John promised his doctor he would not smoke,and he__since then A had never smoked
B never smoked C would never smoke D has never smoked
答
选D
不抽烟 这件事延续到了现在,要用现在完成式.
希望能帮到您,我用的是手机,收不到追问,如果有疑问请发消息给我~