B 从文中前部分的did 知道这个行为是过去式了.A 是你能帮助我,但这个的可能性小点儿；B是你本来可以帮我的； C是你应该帮我的,但这里是过去的,应该是 you should have helped me.C是你一定帮了我了,与前部分不符.
Why did you just sit and watch?You ---- me.
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