问题补充：
---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
答案：
A. when will he be back, comes, will let
(答案→)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
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