在英语语法中，表语从句是一种重要的句式结构，它通常位于系动词之后，用来补充说明主语的具体情况或状态。为了帮助大家更好地理解和掌握这一知识点，以下整理了一些典型的表语从句练习题，并附上详细解答。
练习题
1. The reason __________ he was late is that his car broke down on the way.
- A. why
- B. which
- C. that
- D. where
2. It is clear __________ we need more time to finish the project.
- A. what
- B. that
- C. whether
- D. how
3. His suggestion is __________ we should start earlier tomorrow morning.
- A. when
- B. where
- C. that
- D. which
4. That’s exactly __________ I expected.
- A. what
- B. who
- C. how
- D. where
5. The question is __________ they can arrive before dinner.
- A. if
- B. whether
- C. what
- D. when
6. This is __________ he told me last night.
- A. what
- B. that
- C. which
- D. how
7. The fact __________ he has failed twice doesn’t mean he will fail again.
- A. that
- B. because
- C. why
- D. when
8. My idea is __________ we should act immediately.
- A. that
- B. what
- C. which
- D. where
9. It is important __________ you understand this point clearly.
- A. that
- B. whether
- C. what
- D. which
10. The problem is __________ they don’t have enough money for the trip.
- A. why
- B. that
- C. which
- D. where
参考答案及解析
1. A. why
解析：“The reason why...”是固定搭配，表示“……的原因”，因此正确答案为A。
2. B. that
解析：此句中“it”作形式主语，“that”引导的是真正的主语从句，表示“我们确实需要更多时间”。
3. C. that
解析：“is”后面是一个表语从句，用“that”连接，补充说明建议的内容。
4. A. what
解析：“what”引导表语从句，表示“我所期待的东西”。
5. B. whether
解析：“whether”引导表语从句，表示“他们能否在晚饭前到达”。
6. A. what
解析：“what”引导表语从句，表示“他昨晚告诉我的内容”。
7. A. that
解析：“that”引导同位语从句，解释“事实”的具体内容。
8. A. that
解析：“that”引导表语从句，补充说明“我的想法是什么”。
9. A. that
解析：“that”引导主语从句，强调“你清楚理解这一点很重要”。
10. B. that
解析：“that”引导表语从句，补充说明“问题在于他们没有足够的钱”。
通过以上练习题和答案解析，相信大家对表语从句有了更深刻的理解。表语从句的核心在于正确选择引导词，并结合上下文语境进行分析。希望这些题目能够帮助大家巩固相关知识，在实际运用中更加得心应手！
