从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1. --- Oh, dear. I forgot the air tickets.
--- You ______ something.
A. have left B. are always leaving
C. are leaving D. always left
2. --- I ______ so busily recently that I ______ no time to help you with your math.
--- That’s OK. I can manage it by myself.
A. have been working; have
B. have worked; had
C. am working; will have
D. had been working; had had
