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
考查短語辨析，brought down 降低，brought in引入，brought out產(chǎn)生，brought up提出，句意：自從中國執(zhí)行改革開放以來，許多先進(jìn)的科學(xué)技術(shù)已經(jīng)被引入了。故選B。
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