Please tell him _____ my train will arrive and ask him to pick m

Please tell him _____ my train will arrive and ask him to pick me up.
A、what
B、when
C、whether
D、how
【正确答案】：B
【题目解析】：本题考查宾语从句。句意：请告诉他火车什么时候到并让他来接我。表时间的宾语从句应用when引导，作tell的直接宾语，故B正确。