I was supposed her but I failed.A. to help B. to have helped C. to be helping D. will he

问题补充：

I was supposed her, but I failed.

A. to help

B. to have helped

C. to be helping

D. will help

答案：

A. to help

(答案→)B. to have helped

C. to be helping

D. will help

解析：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。