单选题
The alarm clock didn't ring this morning. 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，must have done sth对过去发生事情的推测，肯定已经……，forget to do sth忘记去做
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