could you go and find out ___there is a train to beijing?A.when B.whether请说明理由

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could you go and find out ___there is a train to beijing?A.when B.whether请说明理由
could you go and find out ___there is a train to beijing?A.when B.whether
请说明理由

could you go and find out ___there is a train to beijing?A.when B.whether请说明理由
很明显就是 is there a train to bj?所以,一般疑问句用whether.
用when的话,when is there a train to bj?不觉得怪怪的吗?