题目内容
14．-Who cleaned the classroom just now？-John ．（ ）
| A． | does | B． | did | C． | is | D． | had |
分析 --刚才谁打扫的教室？
--约翰打扫的．
解答 答案：B．A是一般现在时，B是一般过去时．根据"Who cleaned the classroom just now"中的"just now"可知问的是过去发生的事，故要用一般过去时回答．在答语中避免再出现clean，要用did代替，故选B．
点评 本题考查一般过去时的用法，根据关键词选出正确时态．
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