Question

25.After five days- climbing in the mountain,they reached they thought was the place they’d bee

25.After five days- climbing in the mountain,they reached they thought was the place they’d been dreaming of.
A.that B.where
C.which D.what

Answer 1

解析:考查名词性从句。reach是及物动词，其后要跟宾语，句子的结构和意义才完整，所以后面的句子可以确定为宾语从句。而宾语从句中they thought是插入语，缺少主语，所以必须用连接词what,其他各选项虽然都能引导宾语从句，但是它们在引导宾语从句时作用不同于what。
答案:D

Answer 2

选D...
因为前面缺少先行词,不能用定语从句

Answer 3

D.what