I was supposed ____ her, but I failed.A.to help B.to have helped C.to be helping D.will help
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B解析试题分析：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。考点：考查虚拟语气
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。