og10-9

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9. Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.

believe x to be y.

(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      

答案是E，想问下B为什么错，E中的of又是怎么回事？？

宾语从句中的that不是不能省吗？？

awishtosuccess

B it  that重复
E OF 指的是其他中一个TYPE.