DNA致癌病毒感染宿主细胞后，使之发生癌变是因为发生了（）
A.转化
B.转导
C.突变
D.接合
E.转位
参考答案：A
— I'm sorry. I shouldn't have been so rude to you.
— You ________ something not very nice to me, but that's OK. [ ]
A. have said
B. had said
C. were saying
D. did say
下列作家不在唐宋八大家之列的是( )。
A．贾谊
B．韩愈
C．苏轼
D．曾巩
