托福Junior语法模块对定语从句的考查主要集中在关系代词的选用与从句结构辨识。真题中常出现介词提前、非限制性从句等特殊语法现象，要求考生准确判断先行词在从句中的语法成分。
| 关系代词 | 适用场景 | 真题示例 |
|---|---|---|
| that | 限定性从句，先行词含最高级修饰 | The tallest building that stands here... |
| which | 非限定性从句，介词提前结构 | The museum in which we saw... |
| where | 先行词表示地点状语 | The city where the conference was held... |
例题1：
A brood parasite is a creature ____ tricks another bird's nest.
解析：正确答案(D)that，因先行词creature后接限定性定语从句，且从句缺少主语成分。
例题2：
The winter sport ____ competitors wear special shoes has particular rules.
解析：正确答案(B)in which，此题为介词+which结构，先行词sport在从句中作地点状语。
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