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

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

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。

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