OG46(总结帖子外的），谢谢～

Tiangel

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)   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.（if 引导的条件句，从句用一般现在时，主句用一般将来时为什么不对？倒是觉得E的主句用的一般现在时有问题。）

E是不是省略了do?即if calves exercise and associate with other calves, they require less medication and gain weight more quickly than do those raised in confinement.(倒装？)

谢谢NN解答

rt316

这里恐怕是因为表达常理，才不用将来时的。其实OG也特恶心，好几题反复强调if do, will的时态，但是又有两题主句用这种一般现在时，却又不好好说清楚。不过，个人经验看，表示常规现象的可以不用将来时。

Tiangel

谢谢stoneren

“其实OG也特恶心，好几题反复强调if do, will的时态，但是又有两题主句用这种一般现在时，却又不好好说清楚。”

有同感！这里就只能拿常理做解了？

那么E是不是省略了do?即if calves exercise and associate with other calves, they require less medication and gain weight more quickly than do those raised in confinement.(倒装？)

leeon

偶昨天看OG时看到这题还是吃了一惊，感觉SC真是变化没测。用一句时髦的话说就是唯一没有变化的就是变化。

还是应了那句话，答案是比较出来的，所谓的对错也只存在相对正确和相对错误之分吧！

小鱼儿

我想可能是因为C、D中与will gain 并列的前半部分用的时态不是将来时，造成不一致所以错吧。if 后接将来时本身应该是对的。

Tiangel

那么E是不是省略了do?即if calves exercise and associate with other calves, they require less medication and gain weight more quickly than do those raised in confinement.(倒装？)

小鱼儿

比较句式，后面一个比较对象的动词如果同前，一般都可省啊

比如：Mary has more books than Jimmy(has). 省略了动词has.

Tiangel

谢谢：）

paopao

从句用一般现在时 主句用将来时或一般现在时都可以的 这在OG中都有例子也都说明的 没有错的

主要C和D中不平行 主句的两个动作时态不对应所以错

当比较时 两个不同的主语 第二个比较对象可以用those明确指代 而且谓语动作相同时 通常do 省略的

携隐

if条件从句两种用法：1 if x happens ，y will happen； 2 if x heppens, y should happen.should必须省略。

我自己的理解是这样的：

当表达的是事实时，用第1种：假如天下雨，他就不会来了。If it rains, he will not come。这句话的说话者知道这个结果是一定会发生的，下雨他一定不会来。

当表达的是推测、假设或推理，用第2种：假如天下雨，他应该就不会来了吧。If it rains, he (should) not come.这句话的说话者不知道他会不会来，只是作了一个推测。在GMAT中这个should必须省略。

这个题目说的不是确定的事实，不是只要联系就一定会如何如何。这是作者的推理，“应该就会如何如何了吧”的意思，所以用第2种。

这是我自己的结论。NN们指正啊。

[此贴子已经被作者于2004-8-2 12:36:59编辑过]