标题: 关于as，请教大牛 [打印本页] 作者: yali9777 时间: 2010-10-23 08:31 标题: 关于as，请教大牛 Quasars are so distant that their light has takes billions of years to reach the Earth; consequently, we see them as they were during the formation of the universe. 这里as是什么用法呢。。。？？？作者: cc621josh 时间: 2010-11-26 02:49
状语引导词作者: 清绿地 时间: 2011-8-6 23:38
The answer is A. In C, the "during" is unclear, because it makes it sound as if WE are seeing them NOW as if we were seeing them during the formation of the universe. This isn't the intended meaning of the sentence.
In D, the comparison is incorrect. It makes it sound as if they appear to us NOW as they appeared to us during the formation of the universe. But we weren't there back then. Sadly. E does this in an even more egregious way.
In A and B, we have to choose between the past tense and the past perfect. However, we should only be concerned about the tenses in the independent clause that comes after the semicolon. The only verb there is "see" which is in the present, so we only need to use the simple past tense to express an action occurring BEFORE the "see" action. The only time we would need past perfect would be if we had a verb in the clause that was already in the past tense, and we wanted to express an action occurring before THAT.