The alarm o’clock didn’t ring this morning, so you________it last night.

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问题 The alarm o’clock didn’t ring this morning, so you________it last night.

选项 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

答案D

解析本题考查情态动词完成时表过去情况推测的用法，此处需要must have done表示对过去情况的肯定推测。本句意思为：闹钟今早没有响，你昨晚一定忘记上弦了。因此应该选择D。

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