问题
选择题
I took mathematics and physics because I think that _______very important for me to make further
research in this field. [ ]
A. that is
B. they are
C. this
D. which are
答案
答案：B
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I took mathematics and physics because I think that _______very important for me to make further
research in this field. [ ]
A. that is
B. they are
C. this
D. which are
答案：B