He used a knife to cut off this pen.(同义句）He___ off this pen___ a knife
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He used a knife to cut off this pen.(同义句）He___ off this pen___ a knife
He used a knife to cut off this pen.(同义句）
He___ off this pen___ a knife
He used a knife to cut off this pen.(同义句）He___ off this pen___ a knife
cut
with