我用的是交通银行的VISA,双币卡,每次都显示: Your credit card was declined. (Some debit/check cards will decline because they require a billing address which LSAC does not collect.) Enter a different Visa, MasterCard, Discover, or American Express credit card or cancel the request below. 请教这是因为什么原因?怎么解决?谢谢!