A be of importance是一个词组,故而可以排除C.
i think 是一个插入语,在做题目的时候可以将他删除不去看他,这对题目本身没有任何影响的（以后做题目之中I think之类的话可以直接删去,这样做题目就方便很多了.）故排除d
which i think it is 在语法上就错误了,这句话中不能加it
高中英语语法( )he made another wonderful dicovery,_________ of gre
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