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 (E) a significance even greater for the economy than have
答案:D,我选了A
我明白significane 是不可数名词,但是D中,do 不行,如果用could,那一定是D。do 无法与could have 并列啊?