A:强词夺理,漠视市场法律法规
B:置若罔闻,违背诚实守信原则
C:见利忘义,破坏市场准入规则
D:投机取巧,扰乱公平交易秩序
He had hoped to have an opportunity to travel abroad for long. But it was a(n) ______ that he missed it when it came last month.