Can you tell me when_______for Chendu?A leaving B are you leaving C to leave 这个题选B还是C,求详请详细说明一下疑问句中哪种情况是必须用陈述语气

问题描述:

Can you tell me when_______for Chendu?A leaving B are you leaving C to leave 这个题选B还是C,求详
请详细说明一下疑问句中哪种情况是必须用陈述语气