Question

さ や

意味的にも文法的にも削除すべき一語を答える問題です
解説していただきたいです

The landmark discovery of penicillin as a WeapO1 against bacterial
illnesses brought about a golden age during which scores of infectious

diseases that were brought under control, 下 not entirely wiped out.

Answer 1

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み～ぽ

3行目のthatです
during which S were brought～
という関係詞節にします

さ や

回答ありがとうございます