so that和so as to的问题

请问so that... 和so as to是不是可以等同呢？

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（D）

(E) in order that he would marry

为什么此题A不对呢？谢谢！

so as to 通常用在单主语的简单句中，本题应选D

收到~ 谢谢fisherman~