we would have caught the first bus.A. Had we got up earlierB. If we got up earlierC. Sho

问题补充：

, we would have caught the first bus.

A. Had we got up earlier

B. If we got up earlier

C. Should we get up earlier

D. Unless we had got up earlier

答案：

A. Had we got up earlier

B. If we got up earlier

C. Should we get up earlier

D. Unless we had got up earlier

解析：选A。考查倒装和省略。在虚拟语气条件从句中若有were, should, had时可以把if省去而把这三个词放置句首。此处从句表示与过去的事实相反, 故选A项。