Question

一道SAT语法题

（Hearing her speech is being mesmerized) by a great performer.
A. Hearing her speech is being mesmerized
B. To hear her speech is to be mesmerized
答案是B。为什么不能选A呢？谢谢～

Answer 1

To do is to do 是一个很稳定而且很好地句式

而且Hearing经常作为逻辑主语，多半后面会有一个主语。