When we reached looked like a large market, I realized that I had been transported into the future of was still my hometown.
A, where, which B, what, where C, what, what D, where, where
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解析：考查名词性从句。第一个what引导宾语从句，在从句中作主语；第二个what引导宾语从句，在从句中也作主语，故选择C。