OG13-8关于them指代求牛人解答！

jssqzgring

In late 1997, the chambersinside 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 crystallizingandfungus 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 humidityto 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
正确答案E。
我的疑问：OG上解释说CD两项的them指代有歧义，指代tourists。C我理解是因为在主语的位置上，但D就不能理解了。感觉跟正确答案E一样啊。

atlantiswind

(D)    because of moisture that was exhaled by tourists  raising the humidity within them to levels  ...
je04tta 发表于 2013-5-31 06:30

    them怎么可能指代moisture呢。。。单复数都不相符。。。

jssqzgring

恩啊。谢谢啊。。

je04tta

(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
加粗部分，raising the humidity within them直接修饰的是tourists，them只能指代了tourists.
(E)    because moisture exhaled by tourists had raised  the humidity within them to such levels that salt from the stone was crystallizing
加粗部分，had raised ...是moisture的谓语，the humidity within them为moisture的宾语；这部分结构为，because moisture ...had raised the humidity within them...这里的them只能是指代了moisture了。

waytouing

c和d一样啊，them之前离them最近的复数名词就是tourists