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Are there any mistakes in your homework，Jim？ I'm not sure．I ______（not check）it carefully．

The answer to this question is 'didn't check', can I say 'haven't checked'? Why?

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Both are grammatically correct. didn't check indicates that the action was not done in the past, while haven't checked indicates that the action was not done in the past and has continued to not be done. In the context, both are fine.

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