包裹一定是送错了楼。
The parcel must have been delivered to the wrong building.
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must英 /mʌst/|美 /mʌst/
been英 /biːn/|美 /bɪn/
delivered英 /dɪˈlɪvəd/|美 /dɪˈlɪvərd/
解释
must have been delivered 是情态动词 must + 完成时被动语态，表示对过去情况的肯定推测，说话人基于已有信息做出合理推断。
The parcel must have been delivered to the wrong building.
must have been delivered 是情态动词 must + 完成时被动语态，表示对过去情况的肯定推测，说话人基于已有信息做出合理推断。