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

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问题 The alarm clock didn’t ring this morning. 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,从前一句可以知道,后一句是对过去事实的推断,所以D合题意。题意为,今天早晨闹钟没响,一定是你昨晚没有给它上弦。
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