Past Modals
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Her bag and keys were at home, and she didn’t answer her phone all morning. She ________ left her phone at home.
must have
The report was finished in 10 minutes, but it usually takes him 2 hours. He ________ finished it so quickly.
must have
No one came to the 9 a.m. meeting. They were all notified about it. They ________ forgotten.
might/may have
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