A great deal of science and technique has been since China carried out reform and open policy.
A. brought down
B. brought in
C. brought out
D. brought up
网友回答
A. brought down
(答案→)B. brought in
C. brought out
D. brought up
解析：考查短语动词。bring in“引进”，符合语境；bring out“说明，出版，发挥”； bring down“使落下，降低”； bring up“抚养长大，呕吐”。