This is No. 171 of OG. Pls check its explanation.
By the way, I have made a small conclusion between "so...as to " and "so...that". Hope it will give a hand to you.
See the next message,
关于so...as to的用法:
1.so...(adj.)...as to ...(be adj.)
e.g.: You are so generous as to be unbelievable to some strangers.
ETS原题:
Climatic shifts are (so gradual as to be indistinguishable) at first from ordinary fluctuations in the weather.
(A) so gradual as to be indistinguishable[em11]
(B) so gradual they can be indistinguishable
(C) so gradual that they are unable to be distinguished
(D) gradual enough not to be distinguishable
(E) gradual enough so that one cannot distinguish them
2.so...(adj.)...as to ...(do sth.)
e.g.: She was so kind as to phone for a taxi for me. (OALECD第1440页原例.)
OG 88.
The Emperor Augustus, it appears, commissioned an idealized sculpture portrait, the features of which are (so unrealistic as to constitute) what one scholar calls an " artificial face"
(A) so unrealistic as to constitute[em11]
(B) so unrealistic they constituted
(C) so unrealistic that they have constituted
(D) unrealistic enough so that they constitute
(E) unrealistic enough so as to constitute
3. 注意：ETS常考so...as to和so...that的区别：
1). so...as to常修饰adj.短语，作状语，其逻辑主语等于主句主语，通常用于一般性单句(单一主谓句)中；
2). so...that可以修饰adv./adj.短语，做状语，通常用于主从复合句中，不能修饰n.，so...从句若提前，一般需要倒装；
3). so as to 连用作为习语，[em26]
表示“为了作某事”(with the intention of doing sth.)，(通常)只用于单一主谓句中；
e.g.: I left a message so as to be sure of contacting her. (OALECD第1440页原例)
4). so that 连用表示
A).“为的是；以便”(with the aim that; in order that);
e.g.: She worker hard so that everything would be ready by 6o’clock.. (OALECD第1440页原例)
B).“结果；以致；因此”(with the result that; to the extension that)
e.g.: Nothing more was heard from him so that we began to wonder if he was dead. (OALECD第1440页原例)
补充ETS例子：
OG 136.
Although schistosomiasis(血吸虫病, 后面的V.用单数) is not often fatal, it is (so debilitating that it has become an economic) drain on many developing countries.
(A) it is so debilitating that it has become an economic[em11]
(B) it is of such debilitation, it has become an economical
(C) so debilitating is it as to become an economic
(D) such is its debilitation, it becomes an economical
(E) there is so much debilitation that it has become an economical
OG 171.
In 1527 King Henry VIII sought to have his marriage to Queen Catherine annulled (so as to marry) Anne Boleyn.
(A) so as to marry
(B) and so could be married to
(C) to be married to
(D) so that he could marry[em11]
(E) in order that he would marry
Other asmples are under discovering...[em07]
