Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 1)

In April 2002, Erich Ritter, a shark expert, was carrying (76) research in the Bahamas when part of his leg was bitten off by an adult shark that was pursuing a large fish.

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In April 2002, Erich Ritter, a shark expert, was carrying (76)……………………. research in the Bahamas when part of his leg was bitten off by an adult shark that was pursuing a large fish.

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Đáp án: out