（河北唐山一中09高三調(diào)研，11）— Do you still remember when we went to Chongqing?

   —I can’t remember now but ______ sometime last summer?

A. could it be   B. might it be    C. could it have been  D. might it have been

C


解析:

could have done對過去的動作可能性的判斷。

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