倒装练习答案
单项选择。
1-5: CABAC
6-10: BCDBD
11-15: ACDAB
16-20: AACBA
21-25: CADCB
26-30: ABCBD
31-34: DABD
1-5: CABAC
6-10: BCDBD
11-15: ACDAB
16-20: AACBA
21-25: CADCB
26-30: ABCBD
31-34: DABD