在英语语法中，同位语从句是一种用来解释或补充说明名词的从句。它通常紧跟在被修饰的名词之后，用以进一步详细说明该名词的具体内容。例如，“The idea that we should protect the environment is very important.” 这里的“that we should protect the environment”就是一个同位语从句，用来解释说明“idea”的具体内容。
下面是一些关于同位语从句的练习题，附有答案解析，帮助大家更好地理解和掌握这一语法点：
练习题
1. The news ________ he won the first prize made everyone happy.
A. which
B. that
C. what
D. who
2. The order ________ all soldiers must obey is to keep silent.
A. where
B. which
C. whose
D. that
3. The fact ________ the earth moves around the sun is well known.
A. which
B. that
C. why
D. how
4. The suggestion ________ they should hold a meeting next week is reasonable.
A. when
B. that
C. whether
D. where
5. The possibility ________ he might fail has already been considered.
A. which
B. that
C. what
D. why
答案及解析
1. B. “that” 引导的是一个同位语从句，用来解释“news”的具体内容。
2. D. “that” 引导的是一个同位语从句，用来补充说明“order”的具体内容。
3. B. “that” 引导的是一个同位语从句，用来解释“fact”的具体内容。
4. B. “that” 引导的是一个同位语从句，用来补充说明“suggestion”的具体内容。
5. B. “that” 引导的是一个同位语从句，用来解释“possibility”的具体内容。
通过以上练习，我们可以看到，“that” 是引导同位语从句最常用的连接词，用来补充说明前面的名词。希望大家通过这些练习能够更加熟练地运用同位语从句。
