6.Those experiments were a ________ stone towards two of the most important and profitable vaccines in history: the mRNA-based COVID-19 vaccines given to hundreds of millions of people around the world.
(A) obstructing
(B) moving
(C) putting
(D) stepping
詳解 (共 1 筆)
未解鎖
Question Translatio...
私人筆記 (共 1 筆)
未解鎖
正確答案：(D) stepping，表示...
阿摩線上測驗
登入
