1) would suggest that not getting up early is a habit for you. 2) would refer specifically to you getting up late this morning.
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AnonymousUnfortunately, the answer key went for only #2.If you had to pick the best answer, it would be #2, but both are theoretically possible.
AnonymousUnfortunately, the answer key went for only #2.I think the additional sentence "I’m behind with everything today" was supposed to be the clue that this wasn't a case of something habitual.