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This is a pen and that is a knife改為複數形式
這道題的正確答案是：
These are pens and those are knives.
這些是鋼筆，那些是刀子.
RELATED INFORMATIONS
- 1. This book is in that box.（改為複數形式）
- 2. this is knife in the box（變複數句
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