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About 25000 years ago some of NorthAmerica’s early settles walked across the land-------between Siberia andAlask

A、
A、that then is existed
B. existed then
C.that then existed
D. and then existing
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1%的考友选择了A选项

40%的考友选择了B选项

53%的考友选择了C选项

6%的考友选择了D选项

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