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 the answer is A 看了og的解释，还是不很清楚，这里为什么要用一般过去时？（they were during）.为什么不可以用现在一般时？ 不能用they appear是否因为这样就荒谬地说：星星自己跑到我们面前来，星星成了动作地发出者？ 多谢多谢！作者: steveyangxt 时间: 2006-1-6 11:23
during the formation of the universe时间决定时态。
用它意思改变了。
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