单选题
I would have finished my paper
if it was
at all possible, but I wag fully occupied the whole of last week.
A、
had it been
B、
were it
C、
it had been
D、
it were
【正确答案】
A
【答案解析】
[解析] 本句考查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if省略时，had需与主语倒装；因此A为答案。
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