my friend asked me ---------- A,where I had been B.where had I been

就选A,不用知道这句话是什么意思,ask 是动词,动词后接宾语,如果这个宾语是个句子就是宾语从句,如果这个宾语从句是问句,只把特殊疑问词提前其它按照陈述部分来写就可以了.
比如：他问她是谁,He asks who she is.而不能说He asks who is she.
再比如Answer my question what you can see.回答我的问题,你能看见什么,而不能说Answer my question what can you see.因为你结尾时用句号,主要说的是“回答问题”,回答什么问题是次要的,“你看见了什么”是对前边question 的补充.