Question

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

A. comes, comes
B. will come, comes
C. comes, will come
D. came, will come

Answer 1

答案B
第一句为when 引导的宾语从句，从句的时态，要根据时态本身来决定，第二句为if 引导的条件状语，主句为一般将来时，从句要用一般现在时，代替将来时，故选答案为B