I.虚拟语气专练（一） （每题2分，共30分）
1. __________, I would not have made such a serious mistake.
A. If I were more careful B. Were I more careful
C. Had I been more careful D. If I have been more careful
2. ______ there be a flood, what ________?
A. Had ... would we have done B. Should ... should we do
C. Should ... we would do D. Would ... would we do
