Along the major rivers that traverse the deserts of northeast Africa, the Middle East, and northwest India, the combination of a reliable supply of water and good growing conditions both encouraged farming traditions that, in places, endure in at least 6,000 years.
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Agood growing conditions both encouraged farming traditions that, in places, endure in
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Bgood growing conditions encouraged farming traditions that have, in places, endured for
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Cof good growing conditions have encouraged farming traditions that, in places, endured for
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Dof good growing conditions both encouraged farming traditions that have, in places, endured
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Eof good growing conditions encouraged farming traditions that have, in places, been enduring for
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正确答案: B