Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.
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我来举个例子,OG -9。
Astronomers at the Palomar Observatory have discovered adistant supernova explosion, one that they believe is a type previouslyunknown 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)
(E) they believe to be of
one指代adistant supernova explosion。答案是E,that是否必须省略,还是可以省略?请NN们指教。还有如果是that前面是those,又是什么规则?
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