prep上的语法题 求大神解答 谢谢各位

joanna5200

Beneath the soil of the Malheur National Forest in eastern Oregon, a fungus has for centuries been slowly weaving its way through the roots of trees, to become the largest living single organism known to humans.

• Ahas for centuries been slowly weaving its way through the roots of trees, to become
• Bhas slowly woven its way through the roots of trees for centuries, and so becoming
• Cthat has been slowly weaving its way through the roots of trees for centuries has become
• Dthat has for centuries slowly woven its way through the roots of trees and has become
• Ethat, having slowly woven its way through the roots of trees for centuries, to become
  

正确答案为：C 可是疑惑在于 这个for centuries 既有修饰前面has been slowly weaving its way through the roots of trees 的意思 也有修饰become的趋势吧？？求解答啊 谢谢各位

laihong

这里你注意一下has been slowly weaving 这个 present perfect progressive 需要得到证实( for centuries)