17._______ you want to buy the concert ticket, you can use that machine to buyit. (A)Before (B)If (C

問題詳情

17._______ you want to buy the concert ticket, you can use that machine to buyit.
(A)Before
(B)If
(C)So
(D)But

答案：B
難度：簡單0.833333
統計：A(1),B(5),C(0),D(0),E(0)