单选题
The alarm clock didn't ring this morning. You ______ it last night.
A、
need to have 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】
解析：今天早上闹钟没响，你一定是昨天晚上忘了上弦。must have done肯定猜测，forget to do忘记要做。
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