Could you tell me when____?

Could you tell me when____?
A.does the train leave B.will the train leave C.the train has left D.the train leaves
Hurry up,and you 'll catch the early bus.(改为复合句)
____ ____ _____ _____ ,you'll catch the early bus.
Linda left Shanghai after Lily came back.(意思相同)
Linda ___ leave Shanghai ____ Lliy came back.