看白勇，说比较从句谓语与主句谓语相同，可用do did or does代替
主句谓语动词短语使用“助动词或情态动词+verb”的形式，比较从句往往省略verb，保留助动词或情态动词。
比较从句的主语和谓语与主句的主语和谓语相同时，可以全部省略去，常常保留介词短语或状语从句。
请问：如何解释如下两道题！完全矛盾啊~~~
Salt deposits and moisture threaten to destroy the
(A) that flourished at the same time as the civilizations
(B) that had flourished at the same time as had the civilizations
(C) that flourished at the same time those had
(D) flourishing at the same time as those did
(E) flourishing at the same time as those were
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
谢谢~~~
在第一道中，两个从句不是主从关系，the site of an ancient civilization 这个名词短语标志了这是一个同位语从句。
在第二道中，应该注意，“比较从句的主语和谓语与主句的主语和谓语相同时，可以全部省略去，常常保留介词短语或状语从句”有一个前提是than之后的名词或代词不会引起歧义。题中than前后分别有economy和the particulars，是可能引起歧义的。
所以第二道题需要补出助动词。C,E候选。通过比较，C明显比E简洁。选C
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