问题描述：
If we ___ the tickets half a year ago,选什么?
If we ___ the tickets half a year ago,wo would not be able to visit it on May Day now.
A.had not booked B.would not have booked
If we ___ the tickets half a year ago,wo would not be able to visit it on May Day now.
A.had not booked B.would not have booked
问题解答：
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