-- Do you still remember when we went to Nanjing?
--- I can’t remember now but _________ sometime last summer?

-- 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

-- Do you still remember when we went to Nanjing?
--- I can’t remember now but _________ sometime last summer?

1. A.
   might it be
2. B.
   could it be
3. C.
   could it have been
4. D.
   should it have been

— Do you still remember when we went to Nanjing?

— I can't remember now but ________sometime last summer?

1. A.
   might it be
2. B.
   could it be
3. C.
   could it have been
4. D.
   should it have been

— Do you still remember when we went to Nanjing?
— I can't remember now but ________sometime last summer?

1. A.
   might it be
2. B.
   could it be
3. C.
   could it have been
4. D.
   should it have been

— 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

―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

—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

— 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