在学习英语的过程中，宾语从句是一个非常重要的语法知识点。它主要用于表达一个句子作为另一个句子的宾语的情况。为了帮助大家更好地掌握这一知识点，以下是一些专项练习题以及详细的答案解析。

一、单项选择

1. I don't know ______ he will come tomorrow.

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

答案: B. if

解析: 句子中需要一个引导词来连接主句和从句，这里表示“是否”，所以选择“if”。

2. She told me ______ she had finished her homework.

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

答案: C. that

解析: 此处只需要陈述事实，不需要具体的时间、地点或原因，因此使用“that”。

3. Can you tell me ______ the meeting will be held?

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

答案: A. where

解析: 根据句意，“where”可以用来询问地点，符合题意。

4. He asked ______ the news was true or not.

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

答案: A. whether

解析: “whether...or not”结构用于表示“是否”，符合题意。

5. Do you remember ______ we met last time?

A. when B. where C. what D. why

答案: B. where

解析: 根据句意，“where”可以用来询问地点，符合题意。

二、改写句子

6. She said, "I will go to the library this afternoon."

改为间接引语：

答案: She said that she would go to the library that afternoon.

7. They asked, "Do you like playing basketball?"

改为间接引语：

答案: They asked if/whether I liked playing basketball.

8. He said, "The earth goes around the sun."

改为间接引语：

答案: He said that the earth goes around the sun.

9. She asked, "What is your name?"

改为间接引语：

答案: She asked what my name was.

10. He said, "I have already finished my work."

改为间接引语：

答案: He said that he had already finished his work.

通过以上练习，相信大家对宾语从句有了更深的理解。希望大家能够多加练习，熟练掌握这一语法点。