Hi,Tom Can you tell me when ---- for London?A:leaving B:leav

Hi,Tom !Can you tell me when to leave for London?
选C
不定式短语跟when搭配作为间接宾语,表示还未做的事.
A不对,因为leave不是一个持续性的动词,所以不能用when leaving.
B也不对,因为假如用B的话,when后面是一个从句,而这个从句缺主语
D不对,are 和 you 次序反了.Can you tell me when you are leaving for London.