問題詳情

12. ________ the letter, John left for the post office to mail it.
(A) Had written
(B) Having written
(C) Had been writing
(D) Have been writing

參考答案

答案:B
難度:適中0.416548
統計:A(189),B(292),C(103),D(36),E(0)

內容推薦

內容推薦