Jack please tell Tom to call me when he back.Acome B. comesC. cameD. will come

问题补充：

Jack, please tell Tom to call me when he back.

Acome

B. comes

C. came

D. will come

答案：

A. come

(答案→)B. comes

C. came

D. will come

解析：句意：杰克，当汤姆回来的时候，请告诉他给我打电话。分析when引导的时间状语从句，体现主将从现的原则，因此从句用一般现在时，主语第三人称，故选B