Select the grammatically correct sentence:
1. He did not report for work today. He must has gone to the party.
2. He did not report for work today. He must have gone to the party.
3. He did not report for work today. He must go to the party.
4. He did not report for work today. He must had gone to the party.
Answer: B
It is sentence 2.
Must is a modal and takes the bare infinitive, so must have gone. A deduction about a past event always takes must have plus the past participle.
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