---How long ______ in Shanghai?---I will be there attending a conference and giving a speech, which will take about 3 days.A.have you stayedB.are you stayingC.do you stayD.did you stay
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B解析考查时态。根据答句I will be there attending a conference and giving a speech可知对方还没有去上海，所以该句应该是问你将要在上海呆多久？要用将来时态，B项采用进行时be doing表将来。