阿摩線上測驗
35. Ever since the first human being shaped a stone into an axe, we _____ our technology.
(A) have been improving
(B) had improved
(C) were improving
(D) are improving
答案：登入後查看
統計： A(135), B(69), C(19), D(17), E(0) #2062337
統計： A(135), B(69), C(19), D(17), E(0) #2062337
