He certainly revised the old lessons very carefull...

Câu hỏi: He certainly revised the old lessons very carefully. → He must…………………………………………………………………..He must have revised the old lessons very carefully. Ta có : certainly = must have done st (chắc chắn đã làm gì) – hai vế này mang nghĩa bằng nhau, đều chỉ sự chắc chắn

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