The Englishman,who was very hungry by this time and not at all thirsty.局中by是否可以用at代替?

题目

The Englishman,who was very hungry by this time and not at all thirsty.局中by是否可以用at代替?
请说明理由.

答案

不能.请比较和记住
1 at this time 在这个时候（此时此刻）
2 by this time 到此时为止 （也就是说,在“现在”以前）