it 不能指代介词宾语和指代模糊的情况。

览物之情

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

知道答案是E但是不清楚为什么D选项的them会指代有歧义但是E选项的Them没有歧义。代词不是不能指代介词的宾语吗？

Affording strategic proximity to the Strait of Gibraltar, Morocco was also of interest to the French throughout the first half of the twentieth century because they assumed that if they did not hold it, their grip on Algeria was always insecure.

(A) if they did not hold it, their grip on Algeria was always insecure
(B) without it their grip on Algeria would never be secure
(C) their grip on Algeria was not ever secure if they did not hold it
(D) without that, they could never be secure about their grip on Algeria
(E) never would their grip on Algeria be secure if they did not hold it
C 的解释是it可以指代 Morocco  或者 Algeria 但是  Algeria  前面有On不是不能指代吗？
OG78 之前提到过
Fossils of the arm of a sloth found in Puerto Rico in 1991 and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles Islands.
Because sloth is the object of a preposition and not the subject of the sentence, there is no reasonable antecedent for the pronoun it; in this construction, the subject of made is fossils, but it makes no sense to say that the fossils made it the earliest known mammal.
已经完全分不清楚了，希望大家帮忙解答一下，谢谢

alaleiLALA

同问啊，求解答

ashlyzhu

并不是介词后面的就不可以用it 指代吧。。。