单项选择题______ for the free tickets, I would not have gone to the cinema so often. A、if it is not B、Were it not C、Had it not been D、If they were not
不定项选择浮动汇率制是指两国间的货币汇率的形成与变动主要依靠外汇市场上外汇供求关系的变化来调节。