I took mathematics and physics because I think that very important for me to make further

发布时间：2020-08-17 11:48:26

I took mathematics and physics because I think that      very important for me to make further research in this field.
A. what is
B. they are
C. this
D. which are

网友回答

A. what is
(答案→)B. they are
C. this
D. which are
解析：they代替“mathematics and physics”。
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