問題詳情

38. __________ properly, the building would not have burned down.
(A) If the alarm system worked
(C) Should the alarm system work
(B) Had the alarm system worked
(D) If the alarm system works

參考答案

答案：B
難度：困難0.3
統計：A(6),B(3),C(1),D(0),E(0)