---Do you know back tomorrow?
- --Sorry, I don’t know. When he back, I’ll tell you.
A. when does he e, es
B. when he es, will e
C. when he will e, es
D. when will he e, will e
网友回答
A. when does he e, es
B. when he es, will e
(答案→)C. when he will e, es
D. when will he e, will e
解析：根据时间状语，上句问的是将来发生的事情，故用将来时态。主句为将来时态时，从句用一般现在时态，故选C。