22. Mary forgot __________ a letter to her mother, so she wrote to her just now.A. writing B. to write C. to have written
问题描述：
22. Mary forgot __________ a letter to her mother, so she wrote to her just now.
A. writing B. to write C. to have written
答
forget doing 忘记做过
forget to do 忘记去做
所以就选B