and 后面的V 应该和谁并列？

xdai555

句子中出现and 不知道是跟主句的V并列 还是跟从句的V并列 是不是只能看意思了？ 经常错选。

In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.
C. because tourists were exhaling moisture, which had raised the humidity within them to levels
E. because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing
就好像这题
我错选了C 以为 tourist 和 fungus 并列.. - -

42. Scientists have recently discovered what could be the largest and oldest living organism on Earth, a giant fungus that is an interwoven filigree of mushrooms and rootlike tentacles spawned by a single fertilized spore some 10,000 years ago and extending  for more than 30 acres in the soil of a Michigan forest.
(A) extending
(B) extends
(C) extended
(D) it extended
(E) is extending

xdai555

还是说 如果and 跳过从句跟主句的动词并列的话 and 之前一定要加逗号？BTW 这是og12 第6题。