单项选择题

Nearly （） of the Laos area is covered in mountains and forested hills, together with the alluvial plains and terraces of the Mekong. A. a quarter B. half C. three-quarters D. 85%

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Nearly （ ） of the Laos area is covered in mountains and forested hills, together with the alluvial plains and terraces of the Mekong. A. a quarter B. half C. three-quarters D. 85%

Nearly （） of the Laos area is covered in mountains and forested hills, together with the alluvial plains and terraces of the Mekong. A. a quarter B. half C. three-quarters D. 85%