阿摩線上測驗
31 ________ , in the United States, that toothbrushes made of synthetic nylon were introduced.
(A) It wasn’t until 1938
(B) Until 1938
(C) It was until 1938
(D) Being in 1938
.
答案：登入後查看
統計： A(52), B(26), C(34), D(17), E(0) #1256482
統計： A(52), B(26), C(34), D(17), E(0) #1256482
