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.
(A)good growing conditions both encouraged farming traditions that, in places, endure in
(B)good growing conditions encouraged farming traditions that have, in places, endured for
(C)of good growing conditions have encouraged farming traditions that, in places, endured for
(D)of good growing conditions both encouraged farming traditions that have, in places, endured
(E)of good growing conditions encouraged farming traditions that have, in places, been enduring for
题目分析：简单题，根据划线外的combination我们知道在and后面不应该加of，就是supply of water和good growing conditions形成了combination，干掉CDE。A和B选项中的endure所用时态不一样，划线外用了at least 6，000years，强调的意思应该是这种传统已经存在了6，000年了，用完成时态，选B。
