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天山4－Q29 搜了没找到，请NN们帮忙
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.
A. due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing
B due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize
C because tourists were exhaling moisture, which had raised the humidity within them to levels such that salt from the stone would crystallize
D because of moistrue that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize
E because moisture exhaled by toursits had raised the humidity within them to such levels that salt from the stone was crystallizing
Ans E
我的思路，AB its错，D because of 错，C were exhaling moisture 错。只剩下E了，但E中的was crystallizing怎么理解呢？为什么用过去进行时呢？另外，such that 可以用么？ | 
