问题
选择题
We _____ last night,but we went to appreciate the flowerbeds and streetlights in Tian’anmen Square instead.
A．might study
B．could study
C．should have studied
D．must have studied
答案
C
考查虚拟语气。依据题干中的last night可知，A、B两项错误，此处不是表猜测；而must have done表示“一定做过某事”，不符合句意；should have done表示“本应该做某事而没做”。