问题补充：
--- the letter on your way to office.
---OK. I .
A. Don’t forget posting; will
B. Do remember to post; will
C. Do forget to post; do
D. Do remember posting; do
答案：
A. Don’t forget posting; will
(答案→)B. Do remember to post; will
C. Do forget to post; do
D. Do remember posting; do
解析：考查短语辨析：forget to do 忘记要做什么，forget doing 忘记做了某事，remember to do 记得去做某事，remember doing 记得做过某事，句意：一定记住在你去办公室的路上把信寄掉，好吧，我会的。所以选B。
