比较下面的考题：

1. This is the room _________I lived ten years ago.

A. that B. where C. who D. what

2. This is the room _________I lived in ten years ago.

A. that B. where C. who D. what

3. This is the room _________I bought ten years ago.

A. that B. where C. who D. what

4. This is the room _________I visited ten years ago.

A. that B. where C. who D. what

5. This is the room _________I was born ten years ago.

A. that B. where C. who D. what

第1题选B，因为 live 是不及物动词，它无需接宾语;第2题选A，因为虽然 live 不及物，但live in 却是及物，它应有自己的宾语;第3、4题也应选A，因为 buy 和 visit均为及物动词，它们应有自己的宾语;第5应选B，因为 be born 无需有自己的宾语。

四、误认为逗号后一定是非限制性定语从句

有的同学一看见逗号，就以为一定要选which而不选that，但问题是有时根本就不是定语从句。如：

1. If a book is in English, _________ means slow progress for you.

A. as B. which C. what D. that

2. When I say two hours, _________ includes time for eating.

A. as B. which C. what D. that

以上两题均应选that，而不能选which，因为它们根本不是定语从句。之所以选that，是因为句中已有if和when引导的状语从句，逗号后为主句，that为主句主语。