Getting a letter from a professor whose class you excelled in isn't the strongest endorsement since it doesn't directly demonstrate your research experience or potential, but it is necessary if you can't get 3 research-based letters. If you must get a letter from a professor for getting a good grade in his/her class, it's better to have that letter come from a professor who's taught you in an upper-division (possibly graduate) class rather than an introductory class. That shows you've taken the initiative to take on more challenging classes, and a letter commending your achievements in a difficult upper-division course (such as a 15-person seminar) can better demonstrate your potential for graduate-level research work than a letter talking about how you got an A+ in a 400-person freshman class.
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