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题库 / Prep2008E1-SC-174
Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.
so gradual as to be indistinguishable
so gradual so that they can be indistinguishable
so gradual that they are unable to be distinguished
gradual enough not to be distinguishable
gradual enough so that one cannot distinguish them
题目分析：
本题难度主要存在于选项(A)和选项(C)的判断。这里总结一下关于so as to和so that在字面上的区别。so…that可以用作多个主语时，so前面的主语和that后面的主语可以不一样，例如：
I set up the computer so that they could work from home.（我把电脑设置好，这样他们就可以在家办公了。）
so as to要求so前的主语和as to身后动作的主语相同。例如：
I set up the computer so as to do my work. （我把电脑设置好以便完成我的工作）
此时，do my work的主语必须是I。
选项分析：
A选项：Correct. 本选项在语法和逻辑上均是正确的。
B选项：想表达因果关系时，要么说so…that…，要么只说so，而不能用so…so that。
C选项：本选项在语法上没有问题。但在逻辑上，应将so gradual that改为so gradual as to be。这点考查了不定式和从句的区别。用之于本题，由于变化部分是状语，所以需判断主句的发生对状语事件的发生与否是否有直接影响。显然地，主句“主要经济变化是如此的逐渐”这个事件会直接影响“主要经济变化不能在最开始被检测出来”这个事件的发生与否。显然地，经济变化只要具有逐渐这个特点，则其就会具有难以被检测这个特点。因此，只能用不定式短语。
D选项：enough表示“足以”，不能展现出主句和从句的因果关系。
E选项：enough和so…that…是重复的，不能同时出现。
(A) so...as to be 是一个idiom；
(D)and(E)中，enough表示的是"threshold"，so表达的是一个程度，"Enough" implies a sufficient quantity, above a certain threshold - "I have enough money to by the new laptop." "So" is a qualifier meaning "to such a degree that." For example, "I have so much money that I could buy all of the laptops in the world." It doesn't imply any threshold.
so as to要求so前的主语和as to身后动作的主语相同。例如：
I set up the computer so as to do my work. （我把电脑设置好以便完成我的工作）
此时，do my work的主语必须是I。
It would be hard to use X is unable to be Y-ed correctly.
The passive voice and the past participle suggest that something is done (or not done) to X. But the able/unable suggest that X does (or does not) do something. Too abstract? OK, let's get down to the case at hand. Here's the wrong answer you asked about.
关于so as to和so that在字面上的区别。so…that可以用作多个主语时，so前面的主语和that后面的主语可以不一样，例如：
I set up the computer so that they could work from home.（我把电脑设置好，这样他们就可以在家办公了。）
so as to要求so前的主语和as to身后动作的主语相同。例如：
I set up the computer so as to do my work. （我把电脑设置好以便完成我的工作）
此时，do my work的主语必须是I。
考查了不定式和从句的区别，需判断主句的发生对状语事件的发生与否是否有直接影响。
主句的发生对状语事件的发生与否在题中有直接影响，因此必须用不定式。
另关于C我的理解是economic shifts不是人，不应用“能力able”来衡量。
""The portion they are unable to seems to suggest that major economic shifts are unable to do something. This definitely is not the intended meaning.
Hope this helps. :-)
Thanks.
Shraddha""
The passive voice and the past participle suggest that something is done (or not done) to X. But the able/unable suggest that X does (or does not) do something.
The dancer is able to be led.
The dancer is able to follow a lead.
the second one is better
c的解释看不懂
Meredith 5个月前
1. so...that...可以用作多个主语时；so as to 只能用作单一主语时
2. so+adj+as to+verb
3. enough + that/ so as to/ so to/ so that 错误！！！
4. enough for sb 对某人来说足够了
5. enough to do sth 足够做某事
this sentence:
they (= major economic shifts) are unable to be distinguished...
！ we're not actually talking about an "inability" possessed by the economic shifts themselves.
i also find something a bit awkward about the use of "unable" to describe something that's not actually an inability of the subject.
here's what i mean:
this plant is unable to perform photosynthesis.
legitimate, because this actually describes an inability of the plant itself.
m
so gradual as to be indistinguishable； so 。。as to 。。主语同
so gradual that they are unable to be distinguished ； so ，，that。。 主语不同
“这点考查了不定式和从句的区别。用之于本题，由于变化部分是状语，所以需判断主句的发生对状语事件的发生与否是否有直接影响。显然地，主句“主要经济变化是如此的逐渐”这个事件会直接影响“主要经济变化不能在最开始被检测出来”这个事件的发生与否。显然地，经济变化只要具有逐渐这个特点，则其就会具有难以被检测这个特点。因此，只能用不定式短语。” 直接影响👉不定式
c选项为什么可以分辨出不等式和从句哪个优先呀？没有从解答中看出？特点和不等式没有什么必然联系吧？
这个老师只会把你带到沟里，听他的讲解你就完蛋了！
来自ron的解释：
if this is an official problem, then i guess the issue boils down to the fact that the incorrect answer (c) is substantially more wordy than the correct answer (a).
i don't see anything strictly ungrammatical in (c).
i also find something a bit awkward about the use of "unable" to describe something that's not actually an inability of the subject.
they (= major economic shifts) are unable to be distinguished...
i don't like this, because we're not actually talking about an "inability" possessed by the economic shifts themselves.
if we'd said something like "economic shifts are unable to destroy your equity", then i'd find that more appealing.
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be able to 不能用做被动语态。表示能力，不能说他没有被区分的能力
如果是that they are indistinguishable
enough 和 so that 重复了
so...as to.. 和so that意思相同
able/unable to be done，接被动，错误
1. so...that...可以用作多个主语时；so as to 只能用作单一主语时
2. so+adj+as to+verb
3. enough + that/ so as to/ so to/ so that 错误！！！
4. enough for sb 对某人来说足够了
5. enough to do sth 足够做某事
Unable主动发出
A 是主系表结构； C be able to 是情态动词, 所以不用看，直接看distinguished, 是主谓宾结构