问题
选择题
Unluckily, we missed the train. we early.
A．must have set out
B．had set out
C．should have set out
D．set out
答案
答案：C
题目分析：考查情态动词+完成式的用法：句意：不巧的是，我们错过了火车，我们本应该早点出发的。从we missed the train可知我们没有早出发，所以用should have done过去本应该做却没有，must have done过去一定做了..，选C。