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 答案是E~我想问的是E中的them不会引起歧义是不是因为exhaled by tourists 中的by tourists是修饰成分,去不去掉对句子无影响的,而them应该指代的是核心成分,与tourists不在一个层面上,所以说只能去指代chambers?是这样的么?还是优先指代主语?指代because从句的主语不行就继续优先指代主句主语?还是有什么其它的优先指代原则?我凌乱了~~呼唤NN~~