I don't know when he ____,but when he ____,I will let you know.

问题描述:

I don't know when he ____,but when he ____,I will let you know.
A will come ;comes
B comes ;will come
Ccomes;comes
D will come; will come

A
will come 将来~
我也不知道 他将什么时候来
comes 三单