6 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 moisture 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 tourists had raised the humidity within them to such levels that salt from the stone was crystallizing |
这题正选为e， 窝有以下两点搞不太清：
1. 对于e选项， og解释是：them clearly refers to chambers. 窝觉得无法理解，为什么them不能指代tourists呢？ 窝有个猜想：在没有被任何标点符号分开得一个句子，里面出现的代词是不可能指代那个主语的，只有可能解释别的名词。因为tourists和them是在一个句子里的，所以them不能指代tourists。不知道窝这想法可否正确？
2. e选项里的them如果不能指代tourists，那它为什么不能指代visitors呢？ 而一定是指代chambers呢？
