阿摩線上測驗
22. A Chinese scientist who had created the world’s first genetically modified babies revealed that he _____
something wrong and regrettable.
(A) has done
(B) had done
(C) is doing
(D) does
答案：登入後查看
統計： A(19), B(91), C(3), D(9), E(0) #1995290
統計： A(19), B(91), C(3), D(9), E(0) #1995290
