PREP1-3和PREP1-120, 代词指代问题求教

3. (24557-!-item-!-188;#058&001027)
Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their
descendants, popularly known as killer bees, had migrated as far north as southern Texas.

(A) Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil,
(B) In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil,
(C) In less than the 35 years since African honeybees had been released outside Sao Paulo,
Brazil,
(D) It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil,
when
(E) It took less than the 35 years after the time that African honeybees were released outside
Sao Paulo, Brazil, and then

120. (30859-!-item-!-188;#058&004335)

Like any star of similar mass would do, once the Sun has exhausted the hydrogen in its core, it
expands into a red giant, eventually ejecting its outer envelope of gases to become a white dwarf.

(A) Like any star of similar mass would do, once the Sun has exhausted the hydrogen in its core, it
expands into a red giant, eventually ejecting
(B) Like any star of similar mass, once the hydrogen in the Sun's core is exhausted, then it expands
into a red giant and eventually ejects
(C) As in the case of any star of similar mass, once the hydrogen in the Sun's core is exhausted, it
will expand into a red giant, and eventually ejecting
(D) As any star of similar mass would, once the hydrogen in the Sun's core is exhausted it will
expand into a red giant and will eventually eject
(E) As would be the case with any star of similar mass, once the Sun exhausts the hydrogen in its
core, it will expand into a red giant and eventually eject

第3题的答案是Ａ，１２０题的答案是Ｅ．

ＰＲＥＰ语法笔记在讨论１２０题Ｂ项的错误时，说过：在该选项中Sun是以所有格形式出现的，所以it 无法指向所有格形式的Sun，而造成it 指代hydrogen的错误．

而第３题的Ａ项中，African honeybees也是出现在所有格形式中（the release of African honeybees ），这种情况下，后面未划线部分的their还可以正确地指代African honeybees' 吗？

请赐教．谢谢．

of所有格跟名词所有格有本质区别啊。

名词所有格，比如sun's...，这就成了一个词了，无法分开。而...of sun，sun还是独立的，可以被it指代。