问题
Do you know ______? —Sorry, but if he _____ back, I ____ you know as soon as possible.
A:when will he be back, comes, will let
B:when he will be back, will come, will let
C:what time will he be back, will come, let
D:what time he will be back, comes, will let
B:when he will be back, will come, will let
C:what time will he be back, will come, let
D:what time he will be back, comes, will let
正确答案是：
