-Do you still remember when we went to Chongqing? -I can’t remember now but some

—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.should it have been

试题答案

C

解析:

根据句意，表示对过去的推测，故选could have done。