OG-180 疑问

180. Quasars are so distant that their light has taken billions of years to reach the Earth; consequently,[ we see them as they were during ]the formation of the universe.
A. we see them as they were during
B. we see them as they had been during
C. we see them as if during
D. they appear to us as they did in
E. they appear to us as though in

对于答案D E 为什么错，OG的解释我理解起来感觉很别扭，请诸位帮忙下。先THX过。