問題詳情

27. Dr. Wang has ______ research on genetic engineering since the early 80s. From then on, his research group has made many scientificbreakthroughs.
(A) forecast
(B) negotiated
(C) retired
(D) pioneered

參考答案

答案:D
難度:適中0.5
統計:A(1),B(0),C(0),D(1),E(0)

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