77.
Like any star of similar mass would do,
once the Sun has exhausted the hydrogen in its store, 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 store, 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
正确选项是E
请问it确实是指代 the Sun 但是后面的句子中的第二个动词为什么不加S呢 it will expand ... and eventually ejects??才对么？ | 
