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

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

A. comes, comesB. will come, will comeC. 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

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