问题
选择题
I was supposed ____ her, but I failed.
A．to help
B．to have helped
C．to be helping
D．will help
答案
答案：B
题目分析：考查be supposed to have done本应该做…而没做，句意：我本应该帮她，却没能。选B。
点评：有的词组可以表示虚拟：如：was/were going to do 本打算做却没做，would like to have done本打算做却没做。注意记忆清楚。