Some methods to prevent soil erosion are plowing parallel with the slope of hills, to plant trees on unproductive land, and rotating crops
Đáp án D
Kiến thức: Sửa lỗi sai
Giải thích:
to plant => planting
Ở đây ta dùng V-ing để tương ứng ngữ pháp với những động từ khác (plowing, rotating)
Tạm dịch: Một số phương pháp phòng ngừa xói mòn đất là cày song song với độ dốc của đồi, trồng cây trên đất kém năng suất và luân canh.
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