问题补充:
—Sorry. I to post the letter for you.
—Never mind. it myself after school.
A. forget; I’d rather post
B. forgot; I’ll post
C. forgot; I’m going to post
D. forget; I’d better post
答案:
A. forget; I’d rather post
(答案→)B. forgot; I’ll post
C. forgot; I’m going to post
D. forget; I’d better post
解析:由道歉可知,当时“忘记”帮对方寄信了,forget应发生在过去;“放学后自己去寄”是临时的决定,只能用will而不能用表示计划或打算的be going to。