9. Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one (that they believe is) a type previously unknown to science. (A) that they believe is (B) that they believe it to be (C) they believe that it is of (D) they believe that is (E) they believe to be of
Why E? one (that they believe is) a type previously unknown to science. 应该也是一个完整的句子吧，能不能分析一下句子成份呢？
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发表于 2004-8-20 19:52:00
