▲简单时说，当 whose 和 which 都用作定语（即后面跟有被修饰的名词）时，whose 在意义上相当于物主代词 one’s；which 在意义上相当于指示代词 this 或 that。比较：
(1) This is Mary, whose [= and her] father we met last week.
(2) Call again at 11, by which time [= and by that time] the meeting should be over.
▲请看下面一道题：
She may have missed the train, in _______ case she won’t arrive for another hour.
A. whose         B. that         C. which       D. what
此题容易误选 A，因为不少学生认为在定语从句中能用作定语的关系代词只有 whose。因为此题在意义上相当于：
She may have missed the train, and in that case she won’t arrive for another hour. 她可能没赶上火车，要是那样的话，她可能还等一个小时才会到。
▲相关更多分析，请参考英语语法网的以下文章：
1.《是考查定语从句吗？该选in which case吗？》
http://www.yygrammar.com/Article/200902/1104.html
2.《in which case的用法》
http://www.yygrammar.com/Article/200902/1121.html