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The guiding principles of the tax plan released by the Treasury Department could have even a greater significance for the economy than the particulars of the plan.

(A) even a greater significance for the economy than

(B) a significance that is even greater for the economy than

(C) even greater significance for the economy than have

(D) even greater significance for the economy than do（D）

(E) a significance even greater for the economy than have

为什么是用do来连接呢 不是应该用could吗？

Here,  'do' refers to 'could have'.

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我找过那里，不过可能是我对这个链接的结构不太熟悉，没有找到这个题目啊。

你说的这种do代替could have 的用法以前怎么没听说过？能详细讲解一下吗？一般这种结构如果有could在选项里是不是could就更合适？

If you just use 'could', your sentence will be incomplete since you actually need 'could do'.

When u use 'could do', it's redundant.  

The solution is to use 'do' to replace 'could do'.

可是平常的情态动词如can may用在这里的话一般都是 than can或者than may吧,为什么could 在这里特殊呢?

为什么可以用do来替代could do,却不能用have来替代could have?

一定要解答呀·先谢谢