Question

---Do you know _____ back tomorrow?
-  --Sorry, I don’t know. When he _____ back, I’ll tell you.

A．when does he come, comes	B．when he comes, will come
C．when he will come, comes	D．when will he come, will come

Answer 1

C

根據時間狀語，上句問的是將來發生的事情，故用將來時態。主句為將來時態時，從句用一般現在時態，故選C。