Asked by Julia

Unable to find her driver's license, Mary asked the agent whether a credit card would be sufficient enough evidence to prove her identity.

Here, "sufficient enought" is the error. But I do not know why that is. Please explain in details! Thank you.
Answered by Ms. Sue
The two words, "sufficient enough" is redundant. They mean about the same thing.

You can use either of these words. but not both, in this sentence.

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