下面句子里 that 引导的从句修饰的是哪一项？ Engineers have …

第 1 题单选题模拟题较易

下面句子里 that 引导的从句修饰的是哪一项？

Engineers have fitted a sensor to the old dam that can detect cracks thinner than a human hair.

定语从句长难句名词性从句状语从句