在英语学习中，语法是构建语言能力的重要基石。单句语法填空是一种常见的练习形式，旨在帮助学生巩固和掌握基础语法知识。这种题型通常要求考生根据句子结构和语法规则，在空白处填写适当的词或短语。通过这样的练习，学习者不仅能够提高对语法的理解，还能增强他们在实际交流中的表达能力。

以下是一些精选的单句语法填空试题及其参考答案：

1. The book __________ (be) on the table yesterday.

- Answer: was

2. She enjoys __________ (read) novels during her free time.

- Answer: reading

3. If it __________ (rain) tomorrow, we will stay indoors.

- Answer: rains

4. They have been working hard since they __________ (arrive).

- Answer: arrived

5. He promised to call me as soon as he __________ (get) home.

- Answer: got

6. By the end of this month, I __________ (finish) all my assignments.

- Answer: will have finished

7. It is important that she __________ (understand) the instructions clearly.

- Answer: understands

8. Although it was raining heavily, __________ (he) umbrella kept him dry.

- Answer: his

9. We decided to go for a walk instead of __________ (watch) TV.

- Answer: watching

10. This is one of the most interesting books that I __________ (ever read).

- Answer: have ever read

这些题目涵盖了时态、非谓语动词、从句以及代词等多种语法点。通过反复练习此类题目，可以有效提升学生的语法敏感度和应用能力。希望以上练习能为您的学习提供帮助！