I________ my textbook at home. I had to go back for it. A.had forgottenB.had lostC.had leftD.had missed
I________ my textbook at home. I had to go back for it.
A.had forgotten
B.had lost
C.had left
D.had missed
相关考题：
You can-t be here on time ,l think．（合并为一句） ．I________,________ you________,________ here on time．
17、在连续ARQ协议中，出现Go-back–N情况将重传发送端发送窗口中的全部数据。