在英语语法中，名词性从句是一个重要的知识点，它涵盖了主语从句、宾语从句、表语从句以及同位语从句等多种形式。这些从句在句子结构中起到名词的作用，能够表达具体的含义或信息。为了帮助大家更好地掌握这一知识点，我们特意准备了以下名词性从句填空练习题。

一、选择合适的引导词完成下列句子

1. The question is _______ we should go by train or by plane.

A. whether B. what C. how D. where

2. It remains a mystery _______ the universe began.

A. which B. when C. that D. why

3. I don’t know _______ he will come tomorrow.

A. if B. whether C. that D. who

4. She told me _______ she had finished her homework.

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

5. The news _______ our team won the game spread quickly.

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

6. He has no idea _______ to solve this problem.

A. how B. what C. that D. why

7. _________ made him so excited today?

A. What B. Who C. Where D. When

8. The fact _______ he is a doctor is well known.

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

9. _________ you say, I won’t change my mind.

A. No matter what B. No matter who C. No matter where D. No matter when

10. _________ he did was surprising.

A. That B. Which C. What D. Why

二、解析与答案

1. A. whether - 表示“是否”的意思。

2. B. when - 表示“什么时候”。

3. A. if/whether - 表示“是否”。

4. A. that - 引导宾语从句，无实际意义。

5. A. that - 引导同位语从句。

6. A. how - 表示“如何”。

7. A. What - 询问具体内容。

8. A. that - 引导同位语从句。

9. A. No matter what - 不管是什么。

10. C. What - 引导主语从句，表示“所做的事情”。

通过以上练习，希望大家能更加熟练地运用名词性从句中的引导词，并准确理解其在不同语境下的作用。名词性从句的学习需要多做练习和总结规律，只有不断实践才能真正掌握。继续加油！