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(yǔ)辨析，bring down 降低， bring in引入，掙得，bring out產(chǎn)生，bring up 培養(yǎng)，句意：自從中國(guó)執(zhí)行黨的改革開(kāi)放以來(lái)許多先進(jìn)的科學(xué)技術(shù)被引入。所以選B。
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