— Do you still remember when we went to Nanjing?
    — I can't remember now but ________sometime last summer?
A.might it beB.could it be
C.could it have beenD.should it have been
   C 
情態(tài)動(dòng)詞加現(xiàn)在完成式,表示對(duì)過去的推測,could表可能性,should表過去該做而沒做的事。
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