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Astronomers at the Palomar Observatory

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by vishalwin » Wed Sep 30, 2015 11:43 pm
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


I know B is wrong because of 'it'. But after I am unable to eliminate choices.

Can anyone explain this?

Thanks & Regards,
Vishal
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by vishalwin » Wed Sep 30, 2015 11:43 pm
Option C is also wrong because of 'it'
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by GMATGuruNY » Sun Oct 04, 2015 3:19 am
Check my two posts here:

https://www.beatthegmat.com/supernova-t106007.html
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
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