Advancedtechnologyandequipments__

发布时间：2020-07-27 18:55:49

Advancedtechnology and equipments ________ in large quantities from abroad since 1979.A.were brought upB.have brought inC.have been brought upD.have been brought in

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D解析自从1979年以来从国外引进了大量的高科技和设备
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