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!

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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!

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!
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!

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!
表推断的虚拟语气过去时态的用could have done,