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中国大学MOOC答案
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6. This relay system allowed mail to criss-cross the f________ in record time. (–
the edge of land where people live and have built towns, beyond which the country is wild and unknown, especially in the western US in the 19th century
)
6. This relay system allowed mail to criss-cross the f________ in record time. (–
the edge of land where people live and have built towns, beyond which the country is wild and unknown, especially in the western US in the 19th century
)
中国大学MOOC答案
数据帝
2024-05-08
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frontier
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7. It was just a group of c________ riders who had proven their loyalty again and again. (–
willing to work hard and give your time and energy to sth
)
5. They switched m________ every 10-12 miles. (–
a horse that you ride on
)
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