—I’m sorry I forgot the letter for you! I’m really busy these days”—It doesn’t matter I’l

问题补充：

—I’m sorry I forgot the letter for you! I’m really busy these days”

—It doesn’t matter, I’ll post it myself.”

A. to post

B. posting

C. post

D. posted

答案：

(答案→)A. to post

B. posting

C. post

D. posted

解析：A forget to do sth.“忘记要做某事”；forget doing sth.“忘记做过某事”。根据句意，“我”没邮寄信件，故用to do。