问题补充：
— Could you please tell me?
—Tomorrow morning.
A. how I can get to the post office
B. how long can I keep the book
C. when to leave for Beijing
D. where I should take the early bus
答案：
A. how I can get to the post office
B. how long can I keep the book
(答案→)C. when to leave for Beijing
D. where I should take the early bus
解析：句意：你能告诉我什么时候去北京吗？明天早上。疑问词+不定式相当于宾语从句，根据句意故选C.
