Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có lời giải chi tiết (Đề 10)

It took them at least two months learning how to pronounce these words.

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It took them at least two months learning how to pronounce these words.

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It took them at least two months learning how to pronounce these words.  to learn