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Exactly when the first people arrived in ________ we now know as California, no one really knows.


  1. A.
    which
  2. B.
    what
  3. C.
    that
  4. D.
    it
B
考查宾语从句。宾语从句What we now know as California作为介词in的宾语。What引导起该宾语从句,在句中作为动词know的宾语。
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