题干
.--- Robert, you didn’t travel by train?
--- I was going to, but then I decided to go by car______.
A：yet
B：either
C：instead
D：indeed
答案(点此获取答案解析）
C
A：yet
B：either
C：instead
D：indeed
双方，包含着向对立面转化的趋势 
定条件下可以向“进步”转化，体现了矛盾的同一性