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Is usedの方が自然で、文法的にも正しいです。
Isと答えるときは、質問が、what is it that ~みたいな名詞（今回はthread）にbe動詞だけがかかっている時なら使えます。
English
Junior High
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受動態で、used を付けずに、is. で終わってはダメですか？
For
three weeks
What is used to put one thousand paper cranes together?
Mr. Takalas Thread
is
is used.
Yusuke's friends hoped that
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ありがとうございます🙏🙏