base在OG 39，再问so as to...结构

ffen

39.In 1527 King Henry VIII sought to have his marriage to Queen Catherine annulled so as to marry Annie Beloeyn.A. so as to marry
B.and so could be married to
C.to be married to
D.so that he could marry
E.in order that he would marry
OG上的解释是 so as too marry is not idiomatically correct可以理解A选项错是动作施动者不清的原因。
想问的是：什么叫 not idiomatically correct...是这个词组本身就是错的不能用的吗？如果没有歧义，这个词组能用么?
一下子对于so as to的用法有点晕了。因为又看到OG 37的C中的解释只说了： so x as to y is not a correct idiom，难道so...as to...也是不对的么？


请帮忙看一下，谢谢！

fdrandom

感觉so+adj.+as to和这里的so as to还是不一样的结构，so as to更加接近to do要表达的意思。
只是feel，没有更多的题目证实这一点。

ssxxtt27

UP