请教OG46题

楼主，别忘了贴全问题。

46.   A study commissioned by the Department of Agriculture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinement.

(A) associated with other calves, they will require less medication and gain weight quicker than do

(B) associated with other calves, they require less medication and gain weight quicker than

(C) associate with other calves, they required less medication and will gain weight quicker than do

(D) associate with other calves, they have required less medication and will gain weight more quickly than do（E）

(E) associate with other calves, they require less medication and gain weight more quickly than

Choice E, the best answer, uses the adverbial phrase more quickly than to modify the verb phrase gain weight. In A, B, and C, quicker than is incorrect because an adjective should not be used to modify a verb phrase. E is also the only choice with consistent verb tenses. The first verb in the clauses introduced by showed that is exercise. A and B incorrectly compound that present tense verb with a past tense verb, associated. C and D correctly use associate, but C follows with the past tense required and D with the present perfect have required. Both C and D incorrectly conclude with the future tense will gain。

A study shows that if ..., they require...

在宾语从句中套了条件壮语从句

斑竹，我知道这是OG的解释了！

但我想知道的是

A study shows that if ..., they require...

在宾语从句中套了条件壮语从句

哈，是不是斑竹觉得我实在太烦就懒得理我了？

我也这样觉得，所以买了本某牛推荐的章振邦的《新编语法教程》，真的好用！！！

IF条件状语从句第一个规则：如果所诉为客观事实则主句从句一样均为一般现在时态。