they knocked the old man down and roobed him —— his cell phone.A for B from C to D of选什么,为什么选这个?

问题描述:

they knocked the old man down and roobed him —— his cell phone.
A for B from C to D of
选什么,为什么选这个?

D
rob sb of sth 抢走某人的什么东西