2. 专升本
  3. The alarm clock didn’t ring this morning. I______it last night.

The alarm clock didn’t ring this morning. I______it last night.

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问题 The alarm clock didn’t ring this morning. I______it last night.
选项 A、did forgotten to wind
B、may have forgotten winding
C、ought to have forgotten to wind
D、must have forgotten to wind
答案D
解析 句意：今天早上闹钟没有响，我昨晚肯定是忘记给它上发条了。must have forgotten to wind the alarm clock肯定忘记上闹钟了，must have done sth．对过去发生事情的肯定推测，肯定已经做了某事，forget to do sth．忘记去做某事。本题中“闹钟没响是存在的事实，故后面应是肯定的推断。”
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