Bộ 10 đề ôn thi học sinh giỏi Tiếng anh 9 năm 2023 có đáp án (Đề 8)

He is intent on passing the examination, but I’m doubtful ………………………… his chances.

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He is intent on passing the examination, but I’m doubtful ………………………… his chances.

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Giải thích

He is intent on passing the examination, but I’m doubtful about his chances.