If you were older, I you to go there yesterday.
A. would allow
B. should allow
C. would have allowed
D. had allowed
网友回答
A. would allow
B. should allow
(答案→)C. would have allowed
D. had allowed
解析：对过去情况的虚拟，主句用“would/ should/ might/ could + have + 过去分词”。