Bộ 10 đề ôn thi học sinh giỏi Tiếng anh 9 năm 2023 có đáp án (Đề 3)

Since Jennifer was a year younger than her friends, she had a hard time keeping ………………. with them.

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Since Jennifer was a year younger than her friends, she had a hard time keeping ……………….with them.

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Giải thích

Since Jennifer was a year younger than her friends, she had a hard time keeping up with them.