Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions. Prevented the soil from erosion, the trees planted by the fanner many years before were what stopped the flood from reaching his house.

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.