求问一道有关比较的省略问题

domifan

之前在【有关比较的省略问题】https://forum.chasedream.com/thread-909291-1-1.html一贴中有所获益，但遇到另一道题不理解，希望大牛指教：
OG10- 198. Although Napoleon's army entered Russia with far more supplies than they had in their previous campaigns, it had provisions for only twenty-four days.
(A)        they had in their previous campaigns
(B)        their previous campaigns had had
(C)        they had for any previous campaign
(D)        in their previous campaigns
(E)        for any previous campaign
其他选项用“主谓一致”很好排除，但我想知道正确选项E应该怎么解释才好。
这道题的解析：If than is followed by a clause referring to army, the subject of that clause must be singular (it). Furthermore, the verb of that clause will need to be in the past perfect form (had had) because it refers to a time before the simple past of entered. Finally, the preposition for is more precise than in because supplies are gathered for an upcoming campaign. Choices A and C incorrectly use the plural they and the simple past had. Moreover, A uses the less precise in. Choices D and E wisely dispense with the full clause and use a simple prepositional phrase. D, however, uses the imprecise in and the plural their. Only E, the best choice, avoids all the errors mentioned above.  

有一个还原是这个样子：[ The structure here is: …far more supplies than (supplies) for any previous campaign…] form :https://gmatclub.com/forum/although-napoleon-s-army-entered-russia-with-far-more-128057.html

CD自制的prep2008语法笔记的对类似题（见最后）的解答是：这个句子中只是单个名词（这里是supply）的比较，所以不需要考虑than后面补出主谓，只补出介词短语就够了，不用担心后面的介词短语没有平行对象。
真的是这样吗？总结一下是否可理解为：如果只是单个名词的比较，前后名词一致，后者可以省略，后面带什么介词短语都不需要考虑前面有没有介词短语和它对应了吗？请各路大神指教！！

CDprep2008的类似题是：
Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.
a greater proportion than it was
a greater proportion than
a greater proportion than they have been
which is greater than was so      
which is greater than it has been
B  Correct；原句补完整：Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than（the proportion）（television costs had accounted for of the spending）in any previous election；这个句子中只是单个名词(proportion)的比较，所以不需要考虑than后面补出主谓，只补出介词短语就够了，不用担心后面的介词短语in any previou election没有平行对象。

domifan

坚强地自己顶一下！