Go to bed right awayDon’t forget you need to get up as early as you can the early train．

问题补充：

Go to bed right away．Don’t forget you need to get up as early as you can the early train．

A. catch

B. catching

C. caught

D. to catch

答案：

A. catch

B. catching

C. caught

(答案→)D. to catch

解析：考查不定式，不定式表示目的，句子意思“马上睡觉，不要忘记你需要尽可能早起床赶上早班火车”，所以选D