题目内容：

after five hours'drive,they reached( )they thou
after five hours'drive,they reached( )they thought was the place they'd been dreaming of答案是what,

优质解答

这里的what引导的宾语从句,做reach的宾语,其中what在宾语从句中做 thought的宾语.

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答案说they thought是插入语

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that which和where为什么不行

追答：

that 和which引导的是定语从句，这里缺少的是宾语，不是定语 where做地点状语成分，而这里的thought缺少宾语，不是状语