If you get stuck on a difficult item that comes up early in the test

If you get stuck on a difficult item that comes up early in the test, you may not get to ansIf you get stuck on a difficult item that comes up early in the test, you may not get to answer items that test things you know.这词组是何意：items that test things you know.能否语法分析，是定语从句，为何不是items that you know.test things 在这里作什么？

热心网友

这句话指的是如果你在考试较早阶段就胶着在一道难题上，那你可能就没有时间回答那些本来是测试你了解的知识的问题（意指你会的问题）。items that test things you know是双重定语从句--that test things修饰items,表示测试某些方面的问题，而you know修饰things,表示这些方面你是知道的，了解的。

热心网友

that test things (that) you know.是定语从句,test 是动词，先行词items做其主语; things 后面又有个定语从句，先行词things在从句中做宾语，故可省略that.

热心网友

正确。