I don’t know when he______ tomorrow .When he_____ , I’ll let you know.

I don’t know when he _________ tomorrow. If he _________, I’ll let you know.

I don’t know when he _________ tomorrow. If he _________, I’ll let you know.

1. A.
   comes, comes
2. B.
   will come, comes
3. C.
   comes, will come
4. D.
   came, will come