48.5he made another discovery,___of great importance to scie

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48.5
he made another discovery,___of great importance to science
a.which i think is
b.which i think it is
c.which i think it
d.i think is

选A,变成两个句子是：he made another discovery.I think it is of great importance to science.;which引导非限制性定语从句并且作为think的宾语,所以which和it肯定不能同时出现排除bc,which也不可以省略,随意选a.还有一个语法点：of+名词＝形容词

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