在英语四级考试中，定语从句是一个重要的考点，而关系副词where、when、why的选择和使用更是其中的难点。本文将详细讲解这三个关系副词在定语从句中的用法，并附上20例练习题，帮助考生们更好地掌握这一知识点。
一、关系副词where的用法
关系副词where在定语从句中引导表示地点的先行词，相当于in which或at which。例如：
- The bookshop where I bought this book is very popular.（我买这本书的书店非常受欢迎。）
在上面的句子中，where引导的定语从句修饰先行词bookshop，表示“我买这本书的书店”。
二、关系副词when的用法
关系副词when在定语从句中引导表示时间的先行词，相当于at which或on which。例如：
- The day when we first met was unforgettable.（我们第一次见面的那一天令人难忘。）
在上面的句子中，when引导的定语从句修饰先行词day，表示“我们第一次见面的那一天”。
三、关系副词why的用法
关系副词why在定语从句中引导表示原因的先行词，相当于for which。例如：
- The reason why he was late is still unknown.（他迟到的原因仍然不明。）
在上面的句子中，why引导的定语从句修饰先行词reason，表示“他迟到的原因”。
四、20例关系副词选择练习
为了帮助考生们更好地掌握关系副词where、when、why的用法，以下提供20例练习题：
- The city ______ I was born is a beautiful place.
- The time ______ we spent together last summer was wonderful.
- The reason ______ he didn’t come to the meeting is still a mystery.
- The restaurant ______ we had dinner last night was very cozy.
- The day ______ she graduated from college was a proud moment for her family.
- The place ______ we went hiking last weekend was full of beautiful scenery.
- The year ______ I started college was a turning point in my life.
- The reason ______ she left her job is still unclear.
- The moment ______ I saw her again, I knew I still loved her.
- The city ______ they live is known for its rich culture.
- The time ______ we watched the sunset was truly magical.
- The reason ______ he was absent from school is because he was sick.
- The place ______ we got married will always be special to us.
- The day ______ they announced their engagement was exciting.
- The year ______ she won the award was a highlight in her career.
- The reason ______ he didn’t finish the project on time is still being investigated.
- The moment ______ I heard the news, I was shocked.
- The city ______ they traveled to last summer was very hot.
- The time ______ we spent on the beach was relaxing.
- The reason ______ she decided to study abroad is to broaden her horizons.
五、总结
通过以上的讲解和练习，相信考生们对关系副词where、when、why在定语从句中的用法有了更深入的了解。在备考过程中，考生们要多做练习，熟练掌握这三个关系副词的用法，以便在考试中能够准确快速地选出正确答案。
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