48.5he made another discovery,___of great importance to sciencea.which i think isb.which i think it isc.which i think itd.i think is

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48.5he made another discovery,___of great importance to sciencea.which i think isb.which i think it isc.which i think itd.i think is
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48.5he made another discovery,___of great importance to sciencea.which i think isb.which i think it isc.which i think itd.i think is
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

48.5he made another discovery,___of great importance to sciencea.which i think isb.which i think it isc.which i think itd.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

which引导非限制性定语从句
i think是插入语,可去除

A,这是个非限定性定语从句。在非限定定语从句中which不能省略排除d,
b和c多了it,which本身在从句中已经是主语了,it是多余的,固只有a 是正确的。