Hi,
I do not know the explanation. But, based on my signature, I would have picked D.

IMO D
"do not" can mean "neither" because "two events" are in negation or not happening.

(A) or (does not show negation)
(B) nor (we need a main verb and subject (pronoun in this case) as "nor" comes after comma)
(C) or are (does not show negation)
(D) nor are they (they is clear referring to schools - only plural subject in the 1st part of the sentence)
(E) nor are not (two negating terms are awkward and redundant in this case)

thanks a lot smackmartine and frankeistein

IMO D
Your question is do we use nor with not
i think we can use ONLY nor(ie. without neither), and in case not is also present in the sentence its ok. What we need to take care is that when Neither is present, nor MUST be there.
Similarly, if EITHER is there, or MUST be there. BUT remember or can stand alone also, such as X or Y.

Thanks

aspirant2011 wrote:One report concludes that many schools do not have, or likely to have, enough computers to use them effectively.

(A) or
(B) nor
(C) or are
(D) nor are they
(E) nor are not

[spoiler]OA: I have one doubt i.e we use nor with neither, do we use nor with not construction also????[/spoiler]

The OA to this one is a little sketchy as the sentence created via using it is a bit awkward.

If someone were to really want to express what this sentence conveys, the best choice would be "and are not."

One report concludes that many schools do not have, and are not likely to have, enough computers to use them effectively.

Meanwhile, what does this sentence mean anyway?

If a school does not have enough computers, then it's likelihood of having enough computers is ZERO. So saying that the schools do not have and are not likely to have is ridiculously redundant.

I guess the "likely" part is supposedly referring to the future, but as worded it does not.

Here's an analogous example.

I do not have a car and that I have a car is unlikely.

LOL