I don’t know when he tomorrow. If he I’ll let you know. A. comes comesB. will come co

问题补充：

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

答案：

A. comes, comes

(答案→)B. will come, comes

C. comes, will come

D. came, will come

解析：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