Dad decided to build a small tool room with a lock, he would keep his best tools so my brother couldn’t reach them.
A. that
B. which
C. what
D. where
网友回答
A. that
B. which
C. what
(答案→)D. where
解析：句意：爸爸决定建一间带锁的小工具房，他会把他最好的工具放在里面，所以我的兄弟够不到。A. that，限制性定语从句的关系代词；B. which非限制性定语从句的关系代词，可以代替整句的意思；C. what不是定语从句的关系词；D. where定语从句的关系副词。这里用where做地点状语。选D。
考点: 考查非限制性定语从句的用法。