【題目】No one really knows exactly of when the first people arrived inwe now know as California
A.where
B.when
C.what
D.which

【答案】C
【解析】句意：沒有人確切的知道什么時候第一個人到達(dá)我們現(xiàn)在所知道的加利福尼亞。What在句子引導(dǎo)賓語從句，在從句中作know的賓語。故選C。

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