问题
选择题
—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
B
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。