问题
单项选择题
I would have finished my paper if it was at all possible, but I was fully occupied the whole of last week.
A．had it been
B．were it
C．it had been
D．it were
答案
参考答案：A
解析：[分析] 结构应用本句考察的是虚拟语气的应用：因本句表达得是与过去事实相反，主句用的是would have finished，那么if从句应用had been done句式；如将条件从句中的讧省略时，had需与主语倒装；因此A为答案。