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英語択一問題

次の問いの空欄に入れるのに最も適当なものを，下の①～④のうちから一つ選べ。
If I hadn't broken up with Hannah last month, I (　　　) going out with her for two years.

【問題22】

[1]　 will have been
[2]　 would have been
[3]　 had been
[4]　 have been