________ for the free tickets, I would not have gone to see the films so often.

A.If it is not

B.Were it not

C.Had it not been

D.If they were not

答案及解析： C

解析：

主句中would not have gone是对过去情形的虚拟，因此空格处表达对过去虚拟的条件。Had it not been由于省略if，使用倒装语序；正常语序是：If it had not been for the free tickets.也可以用But for the free tickets或Without the free tickets来表示虚拟条件。