I don’t know when my father back but I’ll tell you when he back.A. comes; comes;B. come;

问题补充：

I don’t know when my father back , but I’ll tell you when he back.

A. comes; comes;

B. come;come

C. come; will come

D. will come; comes

答案：

A. comes; comes;

B. come;come

C. come; will come

(答案→)D. will come; comes

解析：句意：我不知道我的父亲何时回来，但当他回来时我会告诉你的。第一空是宾语从句，根据语境可知用一般将来时，第二空是时间状语从句，用一般现在时表将来时，故选D。

考点: 考查动词时态的用法。