大全-352 not as... but as... 的用法， 求教

352.        In 1933 the rubber, clothing, and shipbuilding industries put into effect a six-hour workday, believing it a seeming permanent accommodation rather than a temporary expedient for what many observers thought was an economy made overproductive by advances in technology.

(A) believing it a seeming permanent accommodation rather than a temporary expedient for what many observers thought was

(B) believing it a seeming permanent accommodation instead of a temporary expedient for what many observers thought was

(C) believing that it was not a temporary expedient but a seeming permanent accommodation to what many observers thought of as a

(D) not as a temporary expedient but as a seemingly permanent accommodation to what many observers thought was（D）

(E) not as a temporary expedient but believing it a seemingly permanent accommodation for what many observers thought

答案是D ， AS在此作何种用法， 怎么解释。。。

答案错了

 那正确的答案是什么？

thanks first

等下