I'm not a teacher, but I've certainly been a student. I wouldn't lose any respect for a teacher who said "Oh dear. I wasn't paying close enough attention when I gave you that answer.
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AnonymousI need some professional advice. ... ...
How can I cover this error, I really don't want her to think I don't know what I am talking about.
I would like some advice The professional thing to do is admit your mistake. I can't improve on Grammar Geek's recommendation above.
CJ