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
网友回答
A. that
B. where
C. which
(答案→)D. what
解析：本题考查宾语从句的引导词。去掉没有用的部分they had been dreaming of, 因为这是the place的定语从句。在空白后就剩下了需要引导词的句子 they thought was the place，显然was缺乏主语，引导词要同时有两个作用，选择 what, 可以把what 拆开成n.+that引导定语从句的形式：they reached a place that they thought was the place.