请问补充250题46题

46.   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（A）

(E) they appear to us as though in

虽然听了白大侠的讲解，可是还是不太明白。as 在这里做什么成分呢？为何不用as if呢？

bow