问题补充：
After two hours of hiking, we finally reached Tom thought was the best place to camp.
A. where
B. which
C. what
D. that
答案：
A. where
B. which
(答案→)C. what
D. that
解析：考查名词性从句。reach后面是宾语从句，从句中缺少主语，Tom thought是插入语。故用what。
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