Tom was late for his train, and he asked one of the conductors .A. when was the next train

网友回答

A. when was the next train.
(答案→)B. when the next train was.
C. when is the next train.
D. when the next train.
解析：考查宾语从句的时态和语序：句意：汤姆乘火车迟到了，他问乘务员下班火车是什么时候。因为主句的谓语是asked，宾语从句也要用一般过去式，而且在宾语从句中疑问句的语序要改成陈述句语序，选B。