英语好的帮我做三道单选题啊,

题目

英语好的帮我做三道单选题啊,
上课要讲这三道题,大家帮我看看,
1,If there was Gone with the Wind in the bookstore,I ____it yesterday.
A would have bought B bought C had D may have
2,We regret_____them that the construction materials are out of stock.
A to inform B have informed C informing D informed
3,Since time is limited,there is no possibility putting off_______.
A making the plan B to make the plan C deciding the plan D plan
要写出分析的原因,要细,把这句的翻译也帮我写下啊,

答案

1：A解析：would +完成时,意思是：本应该……但实际上没有…,所以这题目只有A合适.句子的意思是说：如果书店有《Gone with the Wind 》这本书,昨天我应该已经买下了2:A解析：考察一个句型：regret doing sth 很遗憾...