the ball is under the desk改为一般疑问句
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theballisunderthedesk改为一般疑问句theballisunderthedesk改为一般疑问句theballisunderthedesk改为一般疑问句-Istheballundert
the ball is under the desk改为一般疑问句
the ball is under the desk改为一般疑问句
the ball is under the desk改为一般疑问句
-Is the ball under the desk?
-Yes,it is.
-No,it isn't.