Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 năm 2023 có đáp án (Đề 6)

Martin had to clear the room before he could start painting the walls.

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Martin had to clear the room before he could start painting the walls.

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Giải thích

Only when Martin had cleared the room could he start painting the walls.