新东方网络课堂的一道白勇语法题

34．To read of Adams' lengthy separation from her family， her difficult travels， and her constant battles with illness is to fell intensely how harsh life was even for the so-called aristocracy of Revolutionary times.

（A）To read of

（B）Reading about

（C）Having read about

（D）Once one reads of

（E）To have read of

答案是A，我一点思路都没有

另外没划线部分的to fell 是不是应该改成to fall啊？

to do is to do为必对答案，这么记住就得了

这样的题目已经好几次了