英訳したとき括弧内に入るのは？
犯人は彼だと思い込んでいた。
I was (　　) the assumption that he was the culprit.
⑴in ⑵under ⑶with

答え

⑵under

I was under the assumption that he was the culprit.

～だと思い込む／～という仮定の下で
be under the assumption that
be under the assumption of

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