In preparation for the cold winter months, during the summer, it was the usual custom for prehistoric people to gather and preserve, with smoke or by salting it, as much meat as they could.
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Aduring the summer, it was the usual custom for prehistoric people to gather and preserve, with smoke or by salting it, as much meat as they could
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Bprehistoric people usually gathered as much meat as they could during the summer and preserved it either by smoking or by salting
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Cit was the usual custom of prehistoric people to gather and preserve, either with smoke or by salting, as much meat that they could during the summer
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Dprehistoric people had the custom, during the summer, of gathering and preserving as much meat, either by smoking or salting it, as they could
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Eit was usual that prehistoric people would gather and preserve as much meat as they could, which was either smoked or salted during the summer
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正确答案: B