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18、Scientists believe native Americans arrived by crossing the land bridge connecting ___ more than 10,000 years ago.

A．that’s now Alaska                                      B．which Alaska is now 

C．is now Alaska                                          D．what is now Alaska

18、D

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Scientists believe native Americans arrived by crossing the land bridge connecting ___ more than 10,000 years ago.

A．that’s now Alaska                                      B．which Alaska is now 

C．is now Alaska                                          D．what is now Alaska

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