--- Got your US visa?
---Not yet. I too busy to apply for an appointment, so I didn’t go to Shanghai last week?
A. was
B. have been
C. had been
D. would be
网友回答
A. was
B. have been
(答案→)C. had been
D. would be
解析： 句意：--拿到美国签证了吗？--还没有，我一直忙着申请约会，所以上周没有去上海。由I didn’t go to Shanghai last week，可知一直忙是过去的过去发生的事情，所以用过去完成时，选C。