I’d like to have visited the Palace Museum, but something unexpected to my father.
A. had happened
B. happened
C. has happened
D. happens
网友回答
A. had happened
(答案→)B. happened
C. has happened
D. happens
解析：考查时态，句意是：我本想参观故宫博物院，但我爸爸发生了预料之外的事，would like to have done本想做…而没有做，说明happen是过去的事。选B。