19. Mom: Are you going out now? It’s already 9 p.m.Mary: I know, but it’s the last day to buy ticket
問題詳情
19. Mom: Are you going out now? It’s already 9 p.m.Mary: I know, but it’s the last day to buy tickets to the basketball games,______ I must go. (A) so (B) because (C) after (D) before