Welast night but we went to the concert instead.A. have studiedB. might study C. should ha

问题补充：

Welast night，but we went to the concert instead.

A. have studied

B. might study

C. should have studied

D. would study

答案：

A. have studied

B. might study

(答案→)C. should have studied

D. would study

解析：“昨晚我们本应该学习但是我们听音乐会去了。”因为是对过去情况的虚拟又根据句意所以选择D。