English Grammar question

label Writing
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

He _____have done it, but I'm not sure. 1. must 2. can't 3. couldn't 4. might

Jan 8th, 2015

4- might

Jan 8th, 2015

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Jan 8th, 2015
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Jan 8th, 2015
Jun 29th, 2017
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