These ancient Indians used to live in ________ is now a part of the United Slates．A.whereB.the placeC.whichD.what
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D解析解析：此题考查名词性从句中连词what的用法。该题中“部分”是介词in的宾语。句中连词what＝the plale which。若从定语从句的角度来研究该题，则B项缺少关系词that或which，A和C项则缺少类似in the place之类的先行词部分。