Have you found your book yet? No,i'm not sure where i__itA must have leftB might leaveC could have leftD can leave答案是c 为什么?求详解!
问题描述：
Have you found your book yet? No,i'm not sure where i__it
A must have left
B might leave
C could have left
D can leave
答案是c 为什么?求详解!
答
表推断的虚拟语气过去时态的用could have done,