6. 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
我选C, 本题答案是D.
但D中的do到底和什么词平行对称呢?
整句主干是the principles could have greater significance than the particulars （could省略）have.
do代替have，与前面平行
谢谢Ryoking!
我懂了,只有完成时中助动词用have. 比如 I have studied a lot, as she has.
因为这里的could have greater significance中have不是完成时而是表达"有",助动词应该用do.
整句主干是the principles could have greater significance than the particulars （could省略）do.
呵呵，说得对呀，是我忽略了句子的意思，只注意了结构，谢谢啦！
PS：叫我ryo就好了，呵呵，看自己的全名还不习惯。
好的,ryo
No, because "could" is there.
The guiding principle of the tax plan released by the Treasury Department could have even greater significance for the economy than (could) do the particulars of the plan.
44.Though the term ＂graphic design＂may suggest laying out corporate brochures and annual reports, they have come to signify widely ranging work．from package designs and company logotypes to signs，book jackets，computer graphics，and film titles
(D) have suggested corporate brochure and annual report layout, it has signified a wide range of错
og的解释是：The subject of the sentence is the singular noun term，which must be followed by the singular is has rather than the plural they have．
难到may不是情态动词吗
但是如果主语是principle，the principle就应该指某一特定的原则，不能与后面的particulars并列。同时，即使改成particular也犯了逻辑错误，因为计划的条款不能只有一条。
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