Advancedtechnology and equipments ________ in large quantities from abroad since 1979.


  1. A.
    were brought up
  2. B.
    have brought in
  3. C.
    have been brought up
  4. D.
    have been brought in
D
自從1979年以來從國外引進(jìn)了大量的高科技和設(shè)備
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