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I'm sure that someone forgot to lock the door.
Someone must ___________________________________________________________________
![](https://image.exam24h.com/public/2019/04/27/1052_7aac21b01db4e7fe0a14cbd404824ec0_300x300.jpeg)
I'm sure that someone forgot to lock the door.
Someone must ___________________________________________________________________
Someone must have forgotten to lock the door.
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