这个应该是宾语从句还是定语从句
on stepping into the room this morning i was astonished to find the floor covered with --- looked like ants.
应该填哪个词?something / that/ anything/ what
答案是what
为啥不能选something，然后省略 that。看做一个定语从句，something作宾语，充当先行词，that后的作定语修饰它？