Question

the scholar has made another breakthrough in this field,___of great importance to

the scholar has made another breakthrough in this field,___of great importance to the progress of science.
A.i think which is B.which i think it is C.about which i think it is D. which i think is

我想知道原因 谢谢您的帮助

Answer 1

选D
这道题主要考两个知识点：1 插入结构，2 定语从句
其中 插入语i think 可以直接去掉，而不影响定语从句的完整。
同时，which作为关系词，指代的是前面的先行词breakthough（突破）。
整个定语从句可分解为the breakthough(i think) is of great importance to the progress of science.
所以就选D了。

Answer 2

D