大家来讨论一下这个题，不是很懂

lzlsnake

145. 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

ptlove4ever

1. Idiom:
  (1) believe that+clause
  (2) believe to do/be

2. the underlined part acts as an absolute phrase to modify "explosion"

3. "that" functions as an object in the attributive clause and therefore can be omitted.

A: is a complete sentence rather than an absolute phrase   
B: "it" is redundant
C: wordy
D: believe that+clause
E: correct

kenwk

个人觉得选B吧

首先我觉得从逻辑上来说应该是由于爆炸产生的超新星的类型是科学所未知的，而不应该是爆炸。

one就近指代前面的整个发现，即爆炸，所以需要用it指代超新星。

另外，to be有“会成为”的意思在里面 更准确

ptlove4ever

The issue comes from OG10th and E is the correct answer.

babybearmm

My question is that A also can be correct by using “嵌入式关系从句”.

finnlijing

关键是那个one 和that的关系，所以A错了，用嵌入式关系从句的话，one 改为其他的词应该是对的