请问老师:she had since been rushing off to the library a little more often than was strictly necessary for somebody who had no homework to do.加下划线的部分省略了什么主语?
...h took an
opportunity of thanking her. "It keeps him in good humour," said she,
"and I am more obliged to you than I can express." Charlotte assured
her friend of her satisfaction in being useful, and that it amply repaid her
for the little sacrifice of her time. This was very amiable, but Charlotte...