after 5 hours drive,they reached____they thought was the place they'd been dreaming of .

问题描述:

after 5 hours drive,they reached____they thought was the place they'd been dreaming of .
A that B where C which D what

B
这提示蒙你的,后面是由place引出的定语从句 the place they'd been dreaming of.而they thought是插入语,可先去掉不看,句子就变成after 5 hours drive,they reached____was the place they'd been dreaming of.这样一看就很明显,是由where引出的地点状语从句~