---Where is your brother?-He is in Beijing. He back in three days. A. will comeB. come

问题补充：

---Where is your brother? ---He is in Beijing. He back in three days.

A. will come

B. comes

C. has come

D. came

答案：

(答案→)A. will come

B. comes

C. has come

D. came

解析：句意：你哥哥在哪？他在北京，他将在三天后回来。In three days三天后，是表将来的时间状语，故谓语用一般将来时，故选A。