George would certainly have attended the proceedings,———
A had he not had a flat tire
B had the tire no flattened itself
C if the flat tire hadn't happened
可以说说为什么不选C吗?
a flat tire的意思是没气的轮胎、瘪了的轮胎。只有和have或get合用时才有爆胎的意思,如have/get a flat tire。所以the flat tire作主语,意思仅仅是没气的轮胎的意思,是无法用happen作谓语的。这不符合英语表达习惯。
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