OG 251 265 比较结构中时态不同，动词是否需要补出

welkin

251. The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's. .

(A)  extinction; its numbers are now five times greater than

(B)  extinction; its numbers are now five times more than

(C)  extinction, their numbers now fivefold what they were

(D)  extinction, now with fivefold the numbers they had

(E)   extinction, now with numbers five times greater than

A, the best choice, uses a singular pronoun, its, to refer to the singular antecedent The gyrfalcon, and it properly uses the construction its numbers are now ... greater than. In B, the construction its numbers are ... more is not idiomatic: there are more birds, but not more numbers. Choices C and D use a plural pronoun, their or they, to refer to a grammatically singular antecedent, The gyrfalcon. Choices D and E wrongly use a phrase introduced by now with to modify The gyrfalcon. In both choices, the phrase confusingly seems to parallel with extinction; a new clause with a present tense verb is needed to state what the gyrfalcon's numbers are now.

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265. Thomas Eakins’ powerful style and his choices of subject—the advances in modern surgery, the discipline of sport, the strains of individuals in tension with society or even with themselves—was as disturbing to his own time as it is compelling for ours.

(A) was as disturbing to his own time as it is

(B) were as disturbing to his own time as they are

(C) has been as disturbing in his own time as they are

(D) had been as disturbing in his own time as it was（B）

(E) have been as disturbing in his own time as

我想问的是，比较结构中前后同为 be的结构，在没有歧异，时态相同的情况下后者省略，这没有问题。但如果是前后的时态不同呢？能省略吗？251里面一个是are，一个是were，后一个省了；265里面一个是were，一个是are，后一个没有省？ 我晕了，这有没有什么标准的啊？时态不同何时能省，何时不能省？还是省或不省都无所谓呢？

BTW，265中的as...as结构是什么和什么在比较啊？怎么补全啊？

麻烦大家了

[此贴子已经被作者于2005-5-19 23:41:51编辑过]

welkin

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一般来说，如果比较前后时态不一致，谓语动词要补充出来。

as....as...的比较结构，前人如下（我持保留态度，因为你这个256题就是主语和谓语都没有省。我也解释不了。）：

as …as; the same …as 的比较结构：

²        前后的主语比较：后面的主语可省略，但要保留与前相对应的定语成份，并要求后面有谓语助词；

1. According to a study by the Carnegie Foundation for the Advancement of Teaching, companies in the United States are providing job training and general education for nearly eight million people, about as many as are enrolled in the nation’s four-year colleges and universities. (A-P1-233)

2. In one of the bloodies battles of the Civil War, fought at sharpsburg, Maryland, on September 17, 1862, four times as many Americans were killed as would later be killed on the beaches of Normandy during D-Day. (C-p90-19)

3.According to Booker T. Whatley’s recent analysis, planting the same crops as are planted on large farms will lead to economic disaster for the small farmer, who should plan a succession of high-value crops that will provide a year-round cash flow. (A-P1-196) the same as are planted on large farms作为crops的定语从句；as是代词，指代crops，在从句中作主语。

²        后面主语若不省，用that/those 代替，则必须把谓语动词省略。

17. Wind resistance created by opening windows while driving results in a fuel penalty at least as great as that incurred by using air conditioning.

21. Newcomers to southern California are surprised to discover that, in spite of the temperate climate, heating bills are at least as high as those in most Midwestern or eastern cities. 后面主语不省，且不是用that/those 代替，则谓语动词可以省略。