一道九上英语填空题He ___ __ ____(写下了)many of the things he has learned from then in scientific papers.

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一道九上英语填空题He ___ __ ____(写下了)many of the things he has learned from then in scientific papers.

一道九上英语填空题He ___ __ ____(写下了)many of the things he has learned from then in scientific papers.
一道九上英语填空题
He ___ __ ____(写下了)many of the things he has learned from then in scientific papers.

一道九上英语填空题He ___ __ ____(写下了)many of the things he has learned from then in scientific papers.
had writen down

has put/written down

had wrote down

had settled down

应该是 has written down

has written down