So...that和such...that结构,如果so和such放在句首,采取半倒装.
所以这句话应该改为：
So absorbed was she in her work that she didin't realisze I was behind her.
当“so/such ...that ...”结构中的so,such连同它所直接修饰的成分共同位于句首表示强调时,主句要倒装(that后面的结果状语从句不倒装).
例如：So angry was he that he couldn’t speak.他愤怒得一句话也说不出来.
(so与作表语的形容词放于句首,主句呈现全部倒装的形式)
// So fast does he run that he is far ahead of others.他跑得如此快,以至于远远领先于其他人.
(so与修饰谓语run的副词fast放于句首,主句呈现部分倒装的形式)
// To such an extent do the parents love their son that they have tried to satisfy every demand of his.父母俩爱子爱到了如此程度,以至于尽量满足他的任何要求.
(to such放于句首,主句呈现部分倒装的形式)
倒装句有几个固定句型,背过,然后来套用就可以了.