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【单选题】

Newly-found fossilized tracks in Alaska proved that dinosaurs' migration between Asia and North America took place ______.
A.much earlier than experts previously thought

B.much later than experts previously thought
C.after Asia became an independent continent
D.sometime around 25 million years ago
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根据网考网移动考试中心的统计,该试题:

72%的考友选择了A选项

27%的考友选择了B选项

0%的考友选择了C选项

1%的考友选择了D选项

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