there are some knives in the pencil-box.变否定句、一般疑问句并作肯定和否定回答,
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there are some knives in the pencil-box.变否定句、一般疑问句并作肯定和否定回答,
there are some knives in the pencil-box.变否定句、一般疑问句并作肯定和否定回答,
there are some knives in the pencil-box.变否定句、一般疑问句并作肯定和否定回答,