Bộ 20 đề ôn thi vào Chuyên Anh năm 2023 cực hay có lời giải (Đề 35)
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Ginseng has featured (1) ____ an active ingredient in oriental medical literature for over 5,000 years.

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 Ginseng has featured (1) ____ an active ingredient in oriental medical literature for over 5,000 years

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Ginseng has featured (1) _ as __ an active ingredient in oriental medical literature for over 5,000 years.