Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 7)

Read the text and think of the word which best fits each gap.Vitamins are substances required for th...

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Read the text and think of the word which best fits each gap.

In this century, thirteen vitamins have (76) ………………………….discovered

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Giải thích

Đáp án: In this century, thirteen vitamins have (76) been discovered.