問題詳情

16. The research is considered a _____ in the treatment of AIDS whose effect is quite different from the previousstudies.
(A) composition
(B) breakthrough
(C) removal
(D) derivation

參考答案

答案:B
難度:簡單0.8
統計:A(4),B(72),C(1),D(9),E(0)

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