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这个虚拟语气的题怎么做?

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/14 06:56:44
这个虚拟语气的题怎么做?
George would certainly have attended the proceedings -----
a)if he didn't get a flat tire
b)if the flat tire hadn't happened
c)had he not had a flat tire
d)had th tire not flattened
C没什么错误,可是B为什么不对?
B
主句是would have的话从句就用had done
从句中had提前只适用于从句放在主句之前时,所以c.d错