It’s nice to see you again. What _____ since we last met?  
A．have you doneB．had you doneC．have you been doingD．did you do
C
考查時態(tài)。句意：很高興又見到你。自從我們上次見面你一直在做什么？結(jié)合語境可知下文描述的是現(xiàn)在已經(jīng)完成的動作，瞬間動詞do不能和表示一段時間的時間狀語連用，故選C。
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