15.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
正确答案是D , 请问D 中最后的WAS 是做什么成分讲?accommodation to what many observers thought 不就够了吗? what在这里既做thought的宾语, 又做to 的宾语,was加上去是什么意思??