The second 'can' in your example is correct, but it isn't necessary. When you think about parallelism, think about the 'root phrase' - the part of the sentence that all of the parallel elements 'grow from'. Both of these sentences are correct, but they just have different root phrases, which I've bolded:
Danny can eat 20 donuts in a sitting and can run 15 miles without breaking a sweat.
Danny can eat 20 donuts in a sitting and run 15 miles without breaking a sweat.
As long as the 'parallel elements' all match each other, and they all 'fit' the root phrase, it's fine, regardless of exactly what the root phrase is.
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Re: Displays of aurora borealis
^^ that.
...and, as i explained in my earlier post, this problem has been structured (almost certainly on purpose) so that you don't even have to spend the time figuring this out.
they gave everything the same form, obviating any need to spend the time.
...and, as i explained in my earlier post, this problem has been structured (almost certainly on purpose) so that you don't even have to spend the time figuring this out.
they gave everything the same form, obviating any need to spend the time.