阿摩線上測驗
17. ( )_______ you want to buy the concert ticket, you can use that machine to buy it.
(A)Before
(B)If
(C)So
(D)But
答案：登入後查看
統計： A(31), B(391), C(1), D(0), E(0) #1821207
統計： A(31), B(391), C(1), D(0), E(0) #1821207
