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.
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 （E）they appear to us as though in
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发表于 2007-3-5 17:08:00
