题目内容

13、― 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

试题答案

13、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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