阿摩線上測驗
15. The main ______ to development is the country's gigantic foreign debt.
(A) production
(B) innovation
(C) network
(D) federation
(E) impediment
答案：登入後查看
統計： A(11), B(16), C(4), D(6), E(55) #939611
統計： A(11), B(16), C(4), D(6), E(55) #939611
