单选题
The alarm clock didn't ring this moming. I ______ it last night. A. did forgotten to wind B. may have forgotten winding C. ought to have forgotten to wind D. must have forgotten to wind
【正确答案】
D
【答案解析】must have forgotten to wind the alarm clock肯定忘记上闹钟了，musthave done sth．对过去发生事情的推测，肯定已经做了某事，forget to do sth．忘记去做某事。