Choose the correct sentence:

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• A He could have done it, but he didn't.
• B He could have do it, but he didn't.
• C He could done it, but he didn't.
• D He could of done it, but he didn't.

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Answer: A. He could have done it, but he didn't.

The correct modal structure for past possibility is "could + have + past participle" (done).

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