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 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，肯定已经做了某事，forget to do sth．忘记去做某事。

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成人本科学位英语

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