OG 80

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Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization that flourished at the same time as the civilizations in the Nile delta and the river valleys of the Tigris and Euphrates.
(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 B
(D) flourishing at the same time as those did
(E) flourishing at the same time as those were

the key is A.
Here "moisture threaten to destroy" why use threaten not threated?

3x

lizaz

threaten是动词，用做一般现在时。前半句描述的是现在的情况
threat是名词

小女公子

对比一下12和80，比较中的省略。

12. Formulas for cash flow and the ratio of debt to equity do not apply to new small businesses in the same way as they do to established big businesses, because they are growing and are seldom in equilibrium.

(A)  Formulas for cash flow and the ratio of debt to equity do not apply to new small businesses in the same way as they do to established big businesses, because they are growing and are seldom in equilibrium.

(B)   Because they are growing and are seldom in equilibrium, formulas for cash flow and the ratio of debt to equity do not apply to new small businesses in the same way as they do to established big businesses.

(C)  Because they are growing and are seldom in equilibrium, new small businesses are not subject to the same applicability of formulas for cash flow and the ratio of debt to equity as established big businesses.

(D)  Because new small businesses are growing and are seldom in equilibrium, formulas for cash flow and the ratio of debt to equity do not apply to them in the same way as to established big businesses.

(E)   New small businesses are not subject to the applicability of formulas for cash flow and the ratio of debt to equity in the same way as established big businesses, because they are growing and are seldom in equilibrium.

In C and E, subject to the [same] applicability of... is wordy, awkward, and imprecise; furthermore, are is preferable either before or after established big businesses to complete the comparison.

80. Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization that flourished at the same time as the civilizations in the Nile delta and the river valleys of the Tigris and Euphrates.

(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

In C, had signals the incorrect past perfect; did in D and were in E are awkward and unnecessary(没有歧义的时候补出动词多余，

所以，可否理解为，长句子，复杂结构的比较，补出来比较清晰的话，补，

短句子，简单结构，一眼就清晰的，不补，

am i right？？

薰衣紫草

不对.

请搜索一下, 关于比较的"疱丁解牛"篇, 讲的很清楚

Xandria

小女公子的问题严重weaken了那个总结,请教NN,究竟是因为什么才会一个补出,一个不补出?

Xandria

自己顶!

ring_cheng

楼上兄弟：你把助动词补出/不补出的情况对比一下，就会发现，补与不补都不会影响句意，那么当然越简洁越好啦！

这个贴子可以参考下：

特别是OG12的解释部分（狗狗标红字的部分）http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=54028

seraphblue

哦，就是说在不产生歧义的情况下，首选省略形式，明白了。

titatita

http://forum.chasedream.com/dispbbs.asp?boardid=23&id=24615&star=4#1409410

33楼