She looks very sad.I want to help her but I don't know____to do.A.what B.how C.where D.when选什么

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• She looks very sad.I want to help her but I don't know____to do.A.what B.how C.where D.when
• She looks very sad.I want to help her but I don't know____to do.A.what B.how C.where D.when选什么
• Amy doesn't want to go shopping because she is very busy 对because she is very busy提问（ ）（ ）Amy( )to go shopping?
• it was,i should say ,very kind of you to come all the way to help them.but you didnt have to .分析分析一下句子各成分其实我要问的不是翻译的问题，是道虚拟语气的题，后面有4个选择，didnt have to B,wouldnt have done C,mustnt have done D,mightnt have done,真确答案是A,希望有英语高手从虚拟语气的知识点来阐述为何选A，因为从书上的知识点来说我觉得wouldnt have to 更好，