[SC悬赏令] OG

71. 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.

　　(B) good growing conditions encouraged farming traditions that have, in places, endured for

　　(E) of good growing conditions encouraged farming traditions that have, in places, been enduring for

答案是B，我选的E，我觉得应该是现在完成进行时。that指的traditions，有解析说传统不能现在还支持，我不是很理解。然后前面有没有of应该都可以吧。谢谢！