求助一道prep语法题，我很不明白，请大家帮忙解答~

簌儿簌儿

37. (26417-!-item-!-188;#058&002629)

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
答案D
我不明白的地方是：这两个they指代的主体不一样，怎么能够正确呢？我的理解是，第一个they指代schools，第二个them指代computers。请大家帮忙解答一下。谢谢~！

kevinsuper

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

意思上判断，是说他们不像有，ace排除。。。bd中d满足并列，完了

them是有点混淆，但是毕竟这句话已经这样了，选对了得了，管它呢。。。