Question

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画像のような形容詞と副詞どちらを入れるか迷うことがよくあるのですが何で判断すればいいのでしょうか？😞

1. Mr. White's work has improved
since he
joined the team, thanks to feedback from his
supervisor.
(A) significantly adv
(B) signifies
(C) significant
(D) signified
adj