问题补充：
Janet was angry at .
A. my not waiting for her
B. I didn wait for her
C. me not wait for her
D. me to not wait for her
答案：
(答案→)A. my not waiting for her
B. I didn wait for her
C. me not wait for her
D. me to not wait for her
解析：angry at中介词at后跟动名词。
