_________ 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

根据《中国农业银行操作风险识别管理办法（试行）》（农银发[2009]341号）规定，操作风险识别是指对影响业务及经营管理活动的所有内外部（）及（）进行主动查找、甄别、（）的过程。