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

A.If it is not                B.Were it not

C.Had it not been             D.If they were not

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

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

A．If it is not          B．Were it not        C．Had it not been     D．Should it not be

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

A. If it is not　　　　　 B. Were it not

C. Had it not been　　　　 D. If they were not