问题补充:
-- 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
答案:
A. might it be
B. could it be
(答案→)C. could it have been
D. should it have been
解析:考查情态动词。句意:—你还记得我们什么时候去南京的吗?—我记不清楚了,但是也许是去年暑假的某个时间?根据句意说明对过去所发生的情况的推测,故使用“情态动词+have done”;could have done也许做了某事/本可以做某事;should have done本应该做某事;实际上却未做;表示的是虚拟语气。故C正确。