Prevented the soil from erosion, the trees planted by the fanner many years before

Đáp án A

Sửa prevented preventing

Giải thích: giảm mệnh đề quan hệ cho câu có chủ ngữ là “the trees planted by the farmer many years before”

Viết đầy đủ: The trees planted by the farmer many years before, which prevented the soil from erosion, were what stopped the flood from reaching his house.