一、“介词＋关系代词”引导的定语从句
[观察典例]
We'd better fix a date on which we will practice speaking English next week.
In the dark street，there wasn't a single person to whom she could turn for help.
What is most significant is the way in which people have worked in harmony with nature to make these terraces and grow rice.
[归纳用法]
在“介词＋关系代词”引导的定语从句中，关系代词只可用whom或which，不可用that。
[即学即练1] 单句语法填空
①The university in which my brother once studied is very famous.
②This is the man from whom I learned a lot in my life.
③September 30th is the day by which you must pay your bill.
④Do you know the lady with whom our manager is talking in the office?
⑤This is the school of which we are greatly proud.
