题目内容
― Do you still remember when we went to Nanjing?― I can't remember now but ________sometime last summer?
A. might it be B. could it be
C. could it have been D. should it have been
C
解析: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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