请教OG12-6C和E选项的指代问题

舟楫

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 such that salt from the stone would crystallize
(E) because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing
请问为什么C中的them肯定指代从句的主语tourists，而不能指代主句主语呢？
同时，为什么E中的them就只能能指代chambers,而不会有就近指代tourists的可能呢？

wangxiwei

指代 按逻辑指代
在指代中我看到两种说法  一种是 优先指代句子主语 一种是 就近指代
C 按这两种 说法的话 优先指代句子主语   tourists
而E 按这两种说法 moisture humidity 都是单数 那么就发生跳跃指代了 指代主句主语 chambers
千万别想到 by tourists  那就是钻牛角了 呵呵 其实考试的时候 在不到万不得已的情况下 别依据"指代混淆"这一语法点来排除答案
譬如此题 C 错就错在levels such that  还有就是would crystallize 和 was growing on the walls.不平行  答案当然是E了

希望能和你一起进步

舟楫

谢谢你，明白了！！