Although they just met for the first time, they talked _____ they had been friends for many years.

A．as if

B．even if

C．such as

D．so long as

甲深夜超速驾驶车辆，撞到行人，见路上没人发现，便将行人抬上自己的车辆，行驶一段路程后抛弃于路边荒野中，导致行人得不到及时救治而死亡。甲的行为构成（）

A、交通肇事罪

B、故意杀人罪

C、交通肇事罪和故意杀人罪

D、故意伤害致人死亡罪