Scientists believe native Americans arrived by crossing the land bridge that connected Siberia(西伯利亚)and more than 10，000 years ago．A.this is AlaskaB.Alaska is nowC.is now AlaskaD.what is now Alaska
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D解析这题考查what引导的宾语从句：connect后面应该是宾语从句，从句中缺少的是主语，所以用what引导。选D.