I don’t know when my son back but when he back I’ll give you a callA. comes comesB. wil

问题补充：

I don’t know when my son back, but when he back ,I’ll give you a call

A. comes, comes

B. will come, will come

C. comes ,will come

D. will come, comes

答案：

A. comes, comes

B. will come, will come

C. comes ,will come

(答案→)D. will come, comes

解析：此题重点考查时态，第一句由连词when引导的宾语从句，“我不知道我儿子什么时候要来”用一般将来时；第二句由when引导的时间状语从句，主句用将来时从句用一般现在时表将来，故选D