题目内容

A great deal of advanced science and technology has been ______ since China carried out the reform and opening policy.
A．brought downB．brought inC．brought outD．brought up
B
考查短语辨析，brought down 降低，brought in引入，brought out产生，brought up提出，句意：自从中国执行改革开放以来，许多先进的科学技术已经被引入了。故选B。
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