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— 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 
情态动词加现在完成式,表示对过去的推测,could表可能性,should表过去该做而没做的事。
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