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 bv 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 正确为E
这里的them为什么在C和D中指代说seems to refer to tourists而E中却指代正确了呢? 是不是因为代词的指代有这样一个顺序,若是单个句子则优先指代句子主语 若是 s1vo,连词 s2vo(that定从)则定从中的代词优先指代s2,不行再指代s1? 若为 s1vo,连词+if s2vo(that从句),s3vo;则从句中的代词优先指代s2,再s3,最后s1? 也就是说代词的指代顺序为优先指代离它最近的句子的主语?但这样的话D就是说不通了? 不明白啊。。。求指导!!