【题目】do / when / you / back / go / school / to / after / lunch (?)
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【答案】When do you go back to school after lunch?
【解析】
do助动词，when什么时候，you你，go back to回到，school学校，after lunch午饭后，根据所给问号，可知句子是疑问句，根据词义连成句子：午饭后你什么时候回学校？故答案为When do you go back to school after lunch?