for the free tickets, I would not have gone to see films so often.
A. If it is not
B. Had it not been
C. Were it not
D. If they were not
网友回答
A. If it is not
(答案→)B. Had it not been
C. Were it not
D. If they were not
解析：考查虚拟语气的省略倒装：句意是：如果不是因为免费票，我不会这样经常去看电影的。这是一个虚拟语气的句子，与过去事实相反，从句用“had+过去分词”，主句用“would+have+过去分词”。在虚拟语气的句子里，有时可以省略从句中的if,把动词be,助动词had等放在句首。选B。